An atom of an element (X) has its K, L and M shells filled with some electrons. It reacts with sodium metal to form a compound NaX. The number of electrons in the M shell of the atom (X) will be ___

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Solution

Valency of Sodium is 1. Since the element X forms compound with chemical formula NaX, it means, valency of X =1. The number of electrons in the M shell of an atom of X will be seven.

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