Question:
Outermost electronic configuration of a group 13 element, $E$, is $4 \mathrm{~s}^{2}, 4 \mathrm{p}^{1}$. The electronic configuration of an element of p-block period-five placed diagonally to element, $\mathrm{E}$ is :
Correct Option: , 4
Solution:
The element E is Ga and the diagonal element of $5^{\text {th }}$ period is ${ }_{50} \mathrm{Sn}$ having outer electronic configuration will be $[\mathrm{Kr}] 5 \mathrm{~s}^{2} 4 \mathrm{~d}^{10} 5 \mathrm{p}^{2}$