The first ionization energy of boron is less | vedclass

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(C) The electronic configuration of $Be$ $(Z=4)$ is $1s^2 2s^2$,which is a fully filled $s$-orbital.The electronic configuration of $B$ $(Z=5)$ is $1s

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Boron has only one electron in $p$-sub-shell

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(C) The electronic configuration of $Be$ $(Z=4)$ is $1s^2 2s^2$,which is a fully filled $s$-orbital.The electronic configuration of $B$ $(Z=5)$ is $1s^2 2s^2 2p^1$.Removing an electron from $Be$ requires breaking a stable,fully filled $2s$ subshell,which requires more energy.In contrast,the electron in $B$ is removed from the $2p$ subshell,which is easier to remove as it is shielded by the $2s$ electrons and is at a slightly higher energy level.

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

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