The number of electrons in the outermost '$L$' shell of an atom is $5$.
$(a)$ Write its electronic configuration.
$(b)$ What is its valency and why?
$(a)$ Write its electronic configuration.
$(b)$ What is its valency and why?
(N/A) The electronic configuration is $2, 5$.
$(b)$ Its valency is $3$. This is because the atom has $5$ electrons in its outermost shell and requires $3$ more electrons to complete its octet (achieve a stable configuration of $8$ electrons).
$(b)$ Its valency is $3$. This is because the atom has $5$ electrons in its outermost shell and requires $3$ more electrons to complete its octet (achieve a stable configuration of $8$ electrons).
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