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The first ionisation potentials (eV) of ...

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

A

(A) 8.29,9.32

B

(B) 9.32,9.32

C

(C) 8.29,8.29

D

(D) 9.32,8.29

Text Solution

Verified by Experts

The correct Answer is:
D
First ionisation potential of beryllium (Be) is greater than boron (B) 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 gt 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 Bis 8.29 eV
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