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Choose the correct electronic configuration which has the highest difference between first & second ionisation enthalpies

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Choose the correct electronic configuration which has the highest difference between first & second ionisation enthalpies.

(a)  1s2 2s2 2p6 3s2 3p6 4s1 

(b)  1s2 2s2 2p6 3s2 3p6 4s2 

(c)  1s2 2s2 2p4 

(d)  1s2 2s2 2p3

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(a) 1s2 2s2 2p6 3s2 3p6 4s1

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