An element $X$ has a mass number $4$ and atomic number $2$. What is the valency of this element?
(0) The atomic number of element $X$ is $2$.
This means it has $2$ electrons in its $K$ shell.
Since the $K$ shell can hold a maximum of $2$ electrons,it is completely filled.
Therefore,the element is stable and does not need to gain,lose,or share electrons.
Hence,the valency of this element is $0$.
This means it has $2$ electrons in its $K$ shell.
Since the $K$ shell can hold a maximum of $2$ electrons,it is completely filled.
Therefore,the element is stable and does not need to gain,lose,or share electrons.
Hence,the valency of this element is $0$.
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