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Which of the following elements contains only two electrons in the outermost shell?
I) Helium II) Beryllium III) Magnesium
The correct set is

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I and II

II and III

III and I

I, II and III

answer is D.

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Detailed Solution

$He \to 2 e^{-}$

$Be \to 4 e^{-}$

$Mg \to 12 e^{-}$

All the elements have 2 electrons in their outer most shell.

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