Question

Which of these four atoms is the MOST chemically stable given the electron formation of each?

Answer 1

The most chemically stable of the four atoms given the electron configuration of each is; Choice A : He.

Helium (He) is a chemical element with the atomic number 2 on the periodic table. It's electron formation is 1s². It has zero valence electron in it's atomic shell.

Lithium (Li) is a chemical element with the atomic number 3 on the periodic table. It's electron formation is 1s² 2s¹. It has 1 valence electron in it's atomic shell.

Nitrogen (N) is a chemical element with the atomic number is 7 on the periodic table. It's electron formation is 1s² 2s² 2p³. It has 3 valence electron in it's atomic shell.

Sulphur (S) is a chemical element with the atomic number is 16 on the periodic table. It's electron formation is 1s² 2s² 2p⁶ 3s² 3p4. It has 4 valence electron in it's atomic shell.

Chemical stability is measured by the number of valence electron present in a chemical element atomic shell. Therefore Helium (He) has zero (0) valence electron in it's atomic shell making it the most stable amongst the chemical element listed above because elements with zero valence electron are unreactive and are the most stable elements on the periodic table.

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