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Q.

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

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a

1s22s22p63s2

b

1s22s22p63s1

c

1s22s22p6

d

1s22s22p5

answer is B.

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Detailed Solution

Element with one valence electron has large difference between the first and second ionisation energies i. e.,1s22s22p63s1.
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From the ground state electronic configuration of the elements given below, pick up the one with highest value of second ionization energy