Give the total number of electrons, the number of valence electrons, and the number of shells containing electrons in (a) a silicon atom and (b) an argon atom. Give the total number of electrons, the number of valence electrons, and the number of shells containing electrons in (a) a beryllium atom and (b) a sulfur atom.

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Q: Why is the answer B, and not A?

A: The answer is given below

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