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Among the following, the elements of hig...

Among the following, the elements of highest first ionisation enthalpy is

A

C

B

F

C

Be

D

Ne

Text Solution

Verified by Experts

The correct Answer is:
D
The electronic configuration of the given elements is as
`""_(6)C=1s^(2),2s^(2),2p^(2)`
`""_(9)F=1s^(2),2s^(2),2p^(5)`
`""_(4)Be=1s^(2),2s^(2)`
`""_(7)N=1s^(2),2s^(2)2p^(3)`
`""_(10)Ne=1s^(2),2s^(2),2p^(6)`
Thus, Ne has the highest ionisation enthalpy because of its completely filled configuration and high effective nuclear charge.
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