Element A is in the $1^{s t}$ group of the Modern Periodic Table. The formula of its ion will be :

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Solution

The correct option is A

Valency of an element in the $1^{s t}$ group of the Modern Periodic Table is 1. So, it will lose one electron to become $A^{+}$ and gain a stable octet structure.

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Element A is in the $1^{s t}$ group of the modern periodic table. The formula of its ion will be :

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