Which one of these elements does not have its valence shell fully filled?

Neon

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Calcium

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Helium

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Xenon

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Solution

The correct option is B Calcium
Calcium has 20 electrons, 2 in K shell, 8 in L shell, 8 in M shell, 2 in N shell. Therefore N shell is not fully filled.

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Which one of these elements has its valence shell fully filled?

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