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Q.

Which element having following electronic configurations has minimum ionisation potential

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a

1s1

b

1s2,2s22p6

c

1s2,2s22p6,3s1

d

1s2⋅2s22p2

answer is C.

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Detailed Solution

1s22s22p63s1 It belongs to IA group which has least ionisation potential and it decreases down the group
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