1.

From the ground state, electronic configuration of the elements given below, pick up the one with highest value of second ionization energy :

Answer»

`1s^(2)2s^(2) 2P^(6)3S^(2)`
`1s^(2) 2s^(2)2p^(6)3s^(1)`
`1s^(2)2s^(2)2p^(6)`
`1s^(2)2s^(2)2p^(5)`

Solution :`1s^(2), 2s^(2), 2p^(6), 3s^(1) underset(IE_(1))overset(-e )to underset("noble gas "e^(-1) "configuration (most STABLE)") overset(1s^(2), 2s^(2)2p^(6))to underset(IE_(2))overset(-e ) to `


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