The chemical symbol for Sodium is Na. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. is a rare earth element with a metallic silver luster. Ruthenium is a chemical element with atomic number 44 which means there are 44 protons and 44 electrons in the atomic structure. The chemical symbol for Argon is Ar. The bulk properties of astatine are not known with any certainty. Compare and contrast the atomic structure of hydrogen and helium. Thulium is the thirteenth and third-last element in the lanthanide series. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. hydrogen and helium) have only one shell (the K shell) whereas very complex atoms such as uranium have electrons in all seven shells. So the atomic weight is the weighted average of all the isotopes of an element that exists. Platinum is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. The chemical symbol for Actinium is Ac. The chemical symbol for Gold is Au. The chemical symbol for Zinc is Zn. The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Hafnium is a chemical element with atomic number 72 which means there are 72 protons and 72 electrons in the atomic structure. Fermium is a member of the actinide series. Lead has the highest atomic number of any stable element and concludes three major decay chains of heavier elements. Atomic structure - AQA Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. Gallium is a chemical element with atomic number 31 which means there are 31 protons and 31 electrons in the atomic structure. Tantalum is a chemical element with atomic number 73 which means there are 73 protons and 73 electrons in the atomic structure. He + IE → He+ + e− IE = 24.5874 eV. All of the alkali metals have a single valence electron in the outer electron shell, which is easily removed to create an ion with a positive charge – a cation, which combines with anions to form salts. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. The name samarium is after the mineral samarskite from which it was isolated. But its density pales by comparison to the densities of exotic astronomical objects such as white dwarf stars and neutron stars. Radon is a chemical element with atomic number 86 which means there are 86 protons and 86 electrons in the atomic structure. The chemical symbol for Aluminum is Al. So a helium atom with two protons and one neutron is called helium-3, and a carbon atom with six protons and six neutrons is called carbon-12. Gold is a chemical element with atomic number 79 which means there are 79 protons and 79 electrons in the atomic structure. The chemical symbol for Platinum is Pt. Molybdenum is a chemical element with atomic number 42 which means there are 42 protons and 42 electrons in the atomic structure. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. Holmium is a chemical element with atomic number 67 which means there are 67 protons and 67 electrons in the atomic structure. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. It is a noble metal and a member of the platinum group. Helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The chemical symbol for Nickel is Ni. The information contained in this website is for general information purposes only. Cerium is the second element in the lanthanide series. There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Praseodymium is the third member of the lanthanide series and is traditionally considered to be one of the rare-earth metals. A Helium atom, for example, requires the following ionization energy to remove the outermost electron. Francium is a highly radioactive metal that decays into astatine, radium, and radon. What charactristics of the atomic structure of helium make it so much less reactive than hydrogen? The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. Lanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Nickel is a chemical element with atomic number 28 which means there are 28 protons and 28 electrons in the atomic structure. Only about 5×10−8% of all matter in the universe is europium. The chemical symbol for Bismuth is Bi. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. • atomic recoil velocity measurements ... [Bouchendira et al., PRL 106, 080801 (2011)] • -helium fine structure (accurate to 3x10 8) - 1 = 137.035 999 6 (34) Theory: Pachucki and Yerokhin, PRL 104, 070403 (2010) Exp. Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The chemical properties of the atom are determined by the number of protons, in fact, by number and arrangement of electrons. The magnified nucleus is schematic, showing protons in pink and neutrons in purple. Arsenic is a metalloid. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. Because of its closed-shell electron configuration, its density and melting and boiling points differ significantly from those of most other lanthanides. The chemical symbol for Nobelium is No. Under this crisis of atomic physics and the following crisis in nuclear physics, due to the discovery of the assumed uncharged neutron (1932), we prepared in 2002 our paper “ Nuclear structure is governed by the fundamental laws of electromagnetism” which contains also the electron-electron attraction of opposite spin in atomic orbitals. The viscosity of liquid helium is 25 micropoises (water has a viscosity of 10,000 micropoises). However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. As in Newtonian mechanics, no system that consists of more than two particles can be solved with an exact analytical mathematical approach (see 3-body problem) and helium is no exception. All isotopes of radium are highly radioactive, with the most stable isotope being radium-226. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. Tellurium is a chemical element with atomic number 52 which means there are 52 protons and 52 electrons in the atomic structure. Francium is a chemical element with atomic number 87 which means there are 87 protons and 87 electrons in the atomic structure. Helium (He). Major advantage of lead shield is in its compactness due to its higher density. The chemical symbol for Berkelium is Bk. Zinc is a chemical element with atomic number 30 which means there are 30 protons and 30 electrons in the atomic structure. Feel free to ask a question, leave feedback or take a look at one of our articles. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure. Molybdenum a silvery metal with a gray cast, has the sixth-highest melting point of any element. The chemical symbol for Niobium is Nb. www.nuclear-power.net. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Uranium is weakly radioactive because all isotopes of uranium are unstable, with half-lives varying between 159,200 years and 4.5 billion years. Therefore, the number of electrons in neutral atom of Helium is 2. Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. It comes first amongst the family of the noble gases. The chemical symbol for Iron is Fe. In the periodic table, the elements are listed in order of increasing atomic number Z. Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife. The chemical symbol for Gallium is Ga. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. The chemical symbol for Tellurium is Te. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria (such as thermal conductivity or corrosion resistance). It is an intensive property, which is mathematically defined as mass divided by volume: In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion. There is a small positively charged nucleus surrounded by an electron cloud that balances the charge. Helium is the element which you can find on the upper right side of the periodic table with atomic number2. The chemical symbol for Dysprosium is Dy. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. The chemical symbol for Tungsten is W. Tungsten is a rare metal found naturally on Earth almost exclusively in chemical compounds. Lead is soft and malleable, and has a relatively low melting point. Hydrogen would be lighter, but helium is safer. Although there are nine known isotopes of helium ( 2 He) ( standard atomic weight: 4.002 … Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. Einsteinium is a chemical element with atomic number 99 which means there are 99 protons and 99 electrons in the atomic structure. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Antimony is a chemical element with atomic number 51 which means there are 51 protons and 51 electrons in the atomic structure. As you are aware, matter is made up of atoms, and therefore an understanding of the structure of atom is very important. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of helium-4 (atomic number: 2), the most common isotope of the element helium. The chemical symbol for Indium is In. Titanium can be used in surface condensers. Zirconium is mainly used as a refractory and opacifier, although small amounts are used as an alloying agent for its strong resistance to corrosion. Chlorine is a yellow-green gas at room temperature. Californium is a chemical element with atomic number 98 which means there are 98 protons and 98 electrons in the atomic structure. The chemical symbol for Osmium is Os. Curium is a chemical element with atomic number 96 which means there are 96 protons and 96 electrons in the atomic structure. The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. Atoms are made up of protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus. The chemical symbol for Cadmium is Cd. The chemical symbol for Gadolinium is Gd. The chemical symbol for Oxygen is O. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-Émile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segrè, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Müller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths. Lanthanum is a chemical element with atomic number 57 which means there are 57 protons and 57 electrons in the atomic structure. In the perspective of quantum mechanics, helium is the second simplest atom to model, following the hydrogen atom. The chemical symbol for Thorium is Th. To prove they were real, physicist James Chadwick and a team of others created the mass spectrometer. Liquid Helium is called a "quantum fluid" as it displays atomic properties on a macroscopic scale. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Einsteinium is the seventh transuranic element, and an actinide. 113Cd has specific absorption cross-section. Copyright 2021 Periodic Table | All Rights Reserved |, Atomic Number – Protons, Electrons and Neutrons in Helium, Fermium – Periodic Table – Atomic Properties, Lithium – Periodic Table – Atomic Properties. Bromine is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Krypton is a chemical element with atomic number 36 which means there are 36 protons and 36 electrons in the atomic structure. Thulium is a chemical element with atomic number 69 which means there are 69 protons and 69 electrons in the atomic structure. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The number of units of positive charge on the nucleus is usually about half the number of units of mass because about half the nuclear particles are uncharged neutrons. In a feat of modern-day alchemy, atom tinkerers have fooled hydrogen atoms into accepting a helium atom as one of their own ... Atomic disguise makes helium look like hydrogen. Its boiling point is the lowest among all the elements. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z – 1) negative electrons in the atom. The chemical symbol for Hafnium is Hf. It is the heaviest essential mineral nutrient. Strontium is a chemical element with atomic number 38 which means there are 38 protons and 38 electrons in the atomic structure. The chemical symbol for Technetium is Tc. It is one of the least reactive chemical elements and is solid under standard conditions. Neptunium is the first transuranic element. The atomic radius of Helium atom is 28pm (covalent radius). Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. Learning Objectives: Describe the structure of an atom (protons, electrons and neutrons). Erbium is a chemical element with atomic number 68 which means there are 68 protons and 68 electrons in the atomic structure. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. The chemical symbol for Zirconium is Zr. Nobelium is the tenth transuranic element and is the penultimate member of the actinide series. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. The chemical symbol for Tantalum is Ta. The chemical symbol for Francium is Fr. Lawrencium is a chemical element with atomic number 103 which means there are 103 protons and 103 electrons in the atomic structure. Name: Helium Symbol: He Atomic Number: 2 Atomic Mass: 4.002602 amu Melting Point:-272.0 °C (1.15 K, -457.6 °F) Boiling Point:-268.6 °C (4.549994 K, -451.48 °F) Number of Protons/Electrons: 2 Number of Neutrons: 2 Classification: Noble Gas Crystal Structure: Hexagonal Density @ 293 K: 0.1785 g/cm 3 Color: colorless Atomic Structure Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Under standard conditions, it is the lightest metal and the lightest solid element. It is a lanthanide, a rare earth element, originally found in the gadolinite mine in Ytterby in Sweden. The chemical symbol for Europium is Eu. The chemical symbol for Chlorine is Cl. The chemical symbol for Arsenic is As. The chemical symbol for Rubidium is Rb. Atomic Number of Helium Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Our Website follows all legal requirements to protect your privacy. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure. where X is any atom or molecule capable of being ionized, X+ is that atom or molecule with an electron removed (positive ion), and e− is the removed electron. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. Cerium is a soft, ductile and silvery-white metal that tarnishes when exposed to air, and it is soft enough to be cut with a knife. Platinum is a chemical element with atomic number 78 which means there are 78 protons and 78 electrons in the atomic structure. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Caesium is a chemical element with atomic number 55 which means there are 55 protons and 55 electrons in the atomic structure. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Helium is composed of two electrons in atomic orbitals surrounding a nucleus containing two protons and (usually) two neutrons. Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract electrons towards this atom. The chemical symbol for Fermium is Fm. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F). The chemical symbol for Thulium is Tm. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. The chemical symbol for Cobalt is Co. Cobalt is found in the Earth’s crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Technetium is the lightest element whose isotopes are all radioactive; none are stable. The chemical symbol for Erbium is Er. The chemical symbol for Rhodium is Rh. 2) You may not distribute or commercially exploit the content, especially on another website. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Iron is a chemical element with atomic number 26 which means there are 26 protons and 26 electrons in the atomic structure. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. Atomic number, atomic mass, and isotopes. The configuration of these electrons follows from the principles of quantum mechanics. Mass numbers of typical isotopes of Helium are 3; 4. Discoverer: Davy, Sir H. and Thénard, L.-J. The Cookies Statement is part of our Privacy Policy. It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. The chemical symbol for Helium is He. Areas covered include atomic structure, physical properties, atomic interaction, thermodynamics, identification, atomic size, crystal structure, history, abundances, and nomenclature. Review - Models of Atom before Teaching Atomic … Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. The darkness of the electron cloud corresponds to the line-of-sight integral over the probability function of the 1s atomic orbital of the electron. Carbon is the 15th most abundant element in the Earth’s crust, and the fourth most abundant element in the universe by mass after hydrogen, helium, and oxygen. Fermium is a chemical element with atomic number 100 which means there are 100 protons and 100 electrons in the atomic structure. Rhodium is a rare, silvery-white, hard, corrosion resistant and chemically inert transition metal. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Typical densities of various substances are at atmospheric pressure. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8. Samarium is a typical member of the lanthanide series, it is a moderately hard silvery metal that readily oxidizes in air. Ytterbium is a chemical element with atomic number 70 which means there are 70 protons and 70 electrons in the atomic structure. Atomic Number – Does it conserve in a nuclear reaction? In some respects zinc is chemically similar to magnesium: both elements exhibit only one normal oxidation state (+2), and the Zn2+ and Mg2+ ions are of similar size. Mercury is a heavy, silvery d-block element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. : Smiciklas and Shiner, PRL 105, 123001 (2010) Highly sensitive test of consistency of different theories across a wide range of energy scales. Thorium is moderately hard, malleable, and has a high melting point. The chemical symbol for Polonium is Po. Thus, numerical mathematical methods are required, even to solve the syst… Neptunium is a chemical element with atomic number 93 which means there are 93 protons and 93 electrons in the atomic structure. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Lanthanum is a soft, ductile, silvery-white metal that tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. Neodymium is a soft silvery metal that tarnishes in air. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Main purpose of this project is to help the public learn some interesting and important information about chemical elements, ionizing radiation, thermal engineering, reactor physics and nuclear energy. Tungsten is a chemical element with atomic number 74 which means there are 74 protons and 74 electrons in the atomic structure. The helium atom, whose structure was represented above, has 2 protons and 2 electrons (Z = 2)as well as 2 neutrons. Question1. For stable elements, there is usually a variety of stable isotopes. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Two electrons (white) fill the first electron shell (ring), a very stable configuration. 1) You may use almost everything for non-commercial and educational use. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. It is occasionally found in native form as elemental crystals. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Carbon is one of the few elements known since antiquity. Helium, the lightest of the noble gases, had actually been detected and helium is the only element in the periodic table that was discovered by an astronomer. The chemical symbol for Neptunium is Np. The chemical symbol for Astatine is At. In the periodic table, potassium is one of the alkali metals. Gold is a transition metal and a group 11 element. Lead is a chemical element with atomic number 82 which means there are 82 protons and 82 electrons in the atomic structure. The most commonly used spontaneous fission neutron source is the radioactive isotope californium-252. Europium is one of the least abundant elements in the universe. The chemical symbol for Carbon is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. The chemical symbol for Molybdenum is Mo. Hence A = Z + N = 2 + 2 = 4, and the atom is represented by 42He In the case of an ion the positive or negative charge is indicated as a superscript to the right of the chemical symbol. Radon occurs naturally as an intermediate step in the normal radioactive decay chains through which thorium and uranium slowly decay into lead. Rhodium is a chemical element with atomic number 45 which means there are 45 protons and 45 electrons in the atomic structure. First Ionization Energy of Helium is 24.5874 eV. © 2019 periodic-table.org / see also This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Europium is a moderately hard, silvery metal which readily oxidizes in air and water. It is even less abundant than the so-called rare earths. The chemical symbol for Antimony is Sb. We assume no responsibility for consequences which may arise from the use of information from this website. The chemical symbol for Plutonium is Pu. Iodine is the least abundant of the stable halogens, being the sixty-first most abundant element. Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. Electron affinities are more difficult to measure than ionization energies. Holmium is a part of the lanthanide series, holmium is a rare-earth element. Phosphorus is a chemical element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. The chemical symbol for Iridium is Ir. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. Rhenium is a chemical element with atomic number 75 which means there are 75 protons and 75 electrons in the atomic structure. The chemical symbol for Praseodymium is Pr. The chemical symbol for Chromium is Cr. The chemical symbol for Curium is Cm. The chemical symbol for Neodymium is Nd. i.e., the same atomic number with a different atomic mass of an element. Video transcript. Praseodymium is a chemical element with atomic number 59 which means there are 59 protons and 59 electrons in the atomic structure. Atomic Structure and Crystal Lattice can be Explained after we know about the atomic structure. Number 80 which means there are 5 protons and 50 electrons in the atomic structure the decay product various! 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