If Z = 3, what would be the valency of the element?

Question.
If Z = 3, what would be the valency of the element? Also, name the element.

Solution:
By Z = 3, we mean that the atomic number of the element is 3. Its electronic configuration is 2, 1. Hence, the valency of the element is 1 (since the outermost shell has only one electron). Therefore, the element with Z = 3 is lithium.

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