When we write the configuration we'll put all 11 electrons in orbitals around the nucleus of the Sodium atom. Its electron configuration is $$1s^2 2s^2 2p^6 3s^1$$. It is a soft, silvery-white, highly reactive metal.Sodium is an alkali metal, being in group 1 of the periodic table. The atomic number of sodium is 11. But in sodium ion the last shell has 8 electrons. â¢ Sodium atom is very reactive; therefore, wonât find free in nature. The free metal does not occur in â¦ Sodium is a soft, silvery-white, highly reactive metal. It will ignite spontaneously on water. 1 c. 2 d. 8 Also, the orbitals have a specific order of filling, generally: However, there is some overlap (any chemistry textbook has the details). It is abundant in the sun and other stars. The nex six electrons will go in the 2p orbital. Sodium has 11 electrons â¦ In a neutral sodium atom, the number of protons and electrons are equal. Since 1s can only hold two electrons the next 2 electrons for sodium go in the 2s orbital. 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. It exists as sodium ions in a compound. Atoms that gain extra electrons become negatively charged. What is the mass number of sodium? This means that sodium atoms have 11 protons. The chemical symbol for Sodium is Na. Atomic Number â Protons, Electrons and Neutrons in Sodium. It will float on water. In writing the electron configuration for sodium the first two electrons will go in the 1s orbital. The sodium atom contains 11 electrons, 11 protons, and 12 neutrons. Atoms are neutral; they contain the same number of protons as electrons. Or, we can write distribution of electrons in a sodium atom as 2, 8, 1. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure. 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. Its only stable isotope is 23 Na. Each orbital can hold only two electrons. By removing an electron from this atom we get a positively charged Na + ion that has a net charge of +1. The outermost shell of the sodium ion is the second electron shell, which has eight electrons in it. The resulting model of the atom is called the quantum model of the atom. 0 b. $\ce{Na \rightarrow Na^{+} + e^{-}}$ The cation produced in this way, Na +, is called the sodium ion to distinguish it from the element. â¢ Sodium ion has a +1 charge whereas sodium atom is neutral. â¢ Because of the release of one electron, the sodium ion radius differs from the atomic radius. A neutral sodium atom, for example, contains 11 protons and 11 electrons. Explanation: The mass number is the sum of the neutrons and protons in an atomâ¦ 2 Answers Kaisha May 11, 2017 Mass number= 23. Sodium is a chemical element with the symbol Na (from Latin "natrium") and atomic number 11. 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. A neutral sodium atom is likely to achieve an octet in its outermost shell by losing its one valence electron. a. 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