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