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