The positions of three elements A, B and C in the Periodic Table are shown below:
Giving reasons, explain the following:
(iii) Element B has a valency of 1.

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Solution

Reason why element B has a valency of 1
Because element B is in group 1, it has only one valence electron in its outer shell.
It is possible for it to lose this electron in order to become stable.
As a result, its valency is 1.

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