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Periods in Modern Periodic Table

What is the t...

Question

What is the trend of second ionization energy for elements of 2nd period?

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Solution

After removal of 1 electron from each element of 2nd period , configurations are, Li 1s2 , Be 1s22s1, B 1s2 2s2 , C 1s2 2s2 2p1 , N 1s2 2s2 2p2 , O 1s2 2s2 2p3 , F 1s2 2s2 2p4. So , O will be more than F due to p3 configuration and B will be more than C . Overall order is Be C B N F O Li

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