The positions of three elements $A$ , $B$ and $C$ in the Periodic Table are shown below:
Giving reasons, explain the following:
Element $B$ has a valency of $3$ .

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Solution

Reason why Element B has a valency of 3
In the Periodic Table, element $B$ is a member of the $3^{r d}$ group, so it possesses three valence electrons.
It has a tendency to lose 3 valence electrons to attain the stable configuration.
That is why element B has a valency of $3$ .

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