The first ionisation potentials (eV) of Be an | vedclass

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(D) The first ionization potentials $(eV)$ of $Be$ and $B$ are $9.32 \ eV$ and $8.29 \ eV$ respectively.Generally,as we move from left to right in a p

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$9.32 \ eV, 8.29 \ eV$

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(D) The first ionization potentials $(eV)$ of $Be$ and $B$ are $9.32 \ eV$ and $8.29 \ eV$ respectively.Generally,as we move from left to right in a period,the ionization potential increases due to an increase in effective nuclear charge.However,in the case of $Be$ $(Z=4)$ and $B$ $(Z=5)$,$Be$ has a higher ionization potential than $B$ because $Be$ has a stable,completely filled $2s$ orbital configuration $(1s^2 2s^2)$,which requires more energy to remove an electron compared to the $2p^1$ electron in Boron.Therefore,option $D$ is correct.

The first ionisation potentials $(eV)$ of $Be$ and $B$ respectively are :-

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