1.

Highest energy will be absorbed to eject out the electron in the configuration

Answer»

`1s^(2)2s^(2)2p^(1)`
1s^(2)2s^(2)2p^(3)`
`1s^(2)2s^(2)2p^(2)`
`1s^(2)2s^(2)2p^(4)`

SOLUTION :DUE to high STABILITY of half-filled orbitals.


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