In case of which of the following elements, the fourth energy shell N, fills up even before the third energy shell M is complete with 18 electrons?

Berylium

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Calcium

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Chlorine

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Neon

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Solution

The correct option is B
Calcium
Calcium has an atomic number of 20. The electronic configuration of calcium will be as follows:

$K L M N 2882$

Therefore, the fourth energy shell N of calcium, fills up even before the third energy shell M is complete with 18 electrons.

Hence, the correct answer is option (b).

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