Verified Answer :

A1

The number of valance electrons an element has is determined based on the group they are in.
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Answer:

a. 1

Explanation:

As you know the group 1A elements are also called the Alkali metals and are highly reactive metals because they have only one electron in their valence shell, this means that all prior levels are full and stable, and they have only one electron in the upper level of the valence shell and it is ready to react with any element that is close to it.

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