Match the column.
Column-I
Valence electronic configuration
ns1
ns2
ns2 np!
ns2 np2
Column-II
Successive ionisation energi
(p) 19, 27, 36, 48, 270
(9) 16, 28, 34, 260
(r) 18, 26, 230, 250
(s) 14, 200, 220, 240
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May I know what is ns2np!
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