The ionization energy of boron is less than t | vedclass

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(C) The electronic configuration of $Be$ $(Z=4)$ is $1s^2 2s^2$,which represents a fully filled $2s$ subshell,providing extra stability.The electronic

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the outermost electron in boron occupies a $2p$ orbital

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(C) The electronic configuration of $Be$ $(Z=4)$ is $1s^2 2s^2$,which represents a fully filled $2s$ subshell,providing extra stability.The electronic configuration of $B$ $(Z=5)$ is $1s^2 2s^2 2p^1$.In $B$,the outermost electron is in the $2p$ orbital,which is shielded by the $2s^2$ electrons and is further from the nucleus than the $2s$ electrons of $Be$.Therefore,it is easier to remove the $2p$ electron from $B$ than the $2s$ electron from $Be$,resulting in a lower ionization energy for $B$ compared to $Be$.

The ionization energy of boron is less than that of beryllium because

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