Q.

Which element having the following electronic configuration has minimum ionisation potential ?

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a

1s1

b

1s22s22p6

c

1s2,2s22p6,3s1

d

1s2,2s22p2

answer is C.

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Detailed Solution

(1) 1s22s22p63s1. It belongs to IA group which has least Ionization potential .(2) It readily looses electron to gain noble gas configuration hence it has low I.P.
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