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  4. The first ionisation potential (in eV) of Be and B, respectively are

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Q. The first ionisation potential (in eV) of Be and B, respectively are

AIPMTAIPMT 1998Classification of Elements and Periodicity in Properties

Solution:

First ionisation potential of Be is greater than
boron due to stable configuration
${}_4 Be =1s^2 , 2s^2$
${}_5 B=1s^2,2s^2 2p^1$
Order of attraction of electrons towards nucleus is $2s >2p$, so more amount of energy is required to remove the electron from $2\, s$ orbital in comparison to $2p$ orbital.
So, ionisation potential of $Be$ is $9.32\, eV$ and $B$ is $8.29\, eV$