(D) By $Z = 3$,we mean that the atomic number of the element is $3$.Its electronic configuration is $2, 1$.Since the outermost shell has only $1$ elec

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(D) By $Z = 3$,we mean that the atomic number of the element is $3$.Its electronic configuration is $2, 1$.Since the outermost shell has only $1$ electron,the element needs to lose $1$ electron to achieve a stable configuration.Therefore,the valency of the element is $1$.The element with atomic number $Z = 3$ is lithium.