The free metal does not occur in â¦ What is the mass number of sodium? Its only stable isotope is 23 Na. A sodium atom, which has 11 electrons, has _____ electron(s) in its third energy level. â¢ Sodium ion has a +1 charge whereas sodium atom is neutral. Explanation: The mass number is the sum of the neutrons and protons in an atomâ¦ The atomic number of sodium is 11. In writing the electron configuration for sodium the first two electrons will go in the 1s orbital. Chemistry Matter Elements. Atoms that gain extra electrons become negatively charged. It exists as sodium ions in a compound. Sodium chloride or salt (NaCl) Soda ash (Na 2 CO 3) Baking soda (NaHCO 3) Sodium hydroxide or caustic soda (NaOH) Sodium nitrate or Chilean saltpeter (NaNO 3) Sodium Borate or borax (Na 2 B 4 O 7) Interesting facts: It is found free in nature. The distribution of electrons in the sodium atom is as follows: In the first orbit or K-shell = 2 electrons In the second orbit or L-shell = 8 electrons In the third orbit or M-shell = 1 electron. Or, we can write distribution of electrons in a sodium atom as 2, 8, 1. This means that sodium atoms have 11 protons. Each orbital can hold only two electrons. Sodium is a chemical element with the symbol Na (from Latin "natrium") and atomic number 11. Sodium, element number eleven, is the first element in the third period of the periodic table. 0 b. By removing an electron from this atom we get a positively charged Na + ion that has a net charge of +1. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. It is a soft, silvery-white, highly reactive metal.Sodium is an alkali metal, being in group 1 of the periodic table. It will ignite spontaneously on water. The outermost shell of the sodium ion is the second electron shell, which has eight electrons in it. Atoms are neutral; they contain the same number of protons as electrons. In a neutral sodium atom, the number of protons and electrons are equal. The resulting model of the atom is called the quantum model of the atom. Also, the orbitals have a specific order of filling, generally: However, there is some overlap (any chemistry textbook has the details). 2 Answers Kaisha May 11, 2017 Mass number= 23. But in sodium ion the last shell has 8 electrons. A neutral sodium atom, for example, contains 11 protons and 11 electrons. â¢ Because of the release of one electron, the sodium ion radius differs from the atomic radius. The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. The chemical symbol for Sodium is Na. Since 1s can only hold two electrons the next 2 electrons for sodium go in the 2s orbital. â¢ Sodium atom is very reactive; therefore, wonât find free in nature. Sodium has 11 electrons â¦ $\ce{Na \rightarrow Na^{+} + e^{-}}$ The cation produced in this way, Na +, is called the sodium ion to distinguish it from the element. It will float on water. A neutral sodium atom is likely to achieve an octet in its outermost shell by losing its one valence electron. Sodium is a soft, silvery-white, highly reactive metal. Sodium is a chemical element with atomic number 11 which means there are 11 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. a. Related Questions & Answers: Its electron configuration is $$1s^2 2s^2 2p^6 3s^1$$. It is abundant in the sun and other stars. The nex six electrons will go in the 2p orbital. 1 c. 2 d. 8 Atomic Number â Protons, Electrons and Neutrons in Sodium. 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