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

8.29 eV, 9.32 eV

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9.32 eV, 9.32 eV

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8.29 eV, 8.29 eV

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9.32 eV, 8.29 eV

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Solution

The correct option is D 9.32 eV, 8.29 eV
electronic configuration for B and Be as follows:
Be - $1 s^{2} 2 s^{2}$
B - $1 s^{2} 2 s^{2} 2 p^{1}$
Beryllium has more first ionisation potential because electron is being removed from full filled 2s orbital.

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