Question

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

Answer 1

From the given,

$$\begin{gathered} \mathrm{Atomic}\mathrm{number},\mathrm{Z}=3 \\ \mathrm{Electronic}\mathrm{configuration}\Rightarrow 1{\mathrm{s}}^{2}2{\mathrm{s}}^1 \end{gathered}$$

As the outermost shell has only one electron, the valency is 1.

Hence, the element is Lithium ($\mathrm{Li}$).