1.

The first ionization energy order B, Be, C, O, N among is(a) B < Be < C < 0 < N(b) B < Be < C < N <O(c) Be < B < C < N < O(d) Be < B < C < O < N

Answer»

(a) B < Be < C < 0 < N

The ionisation energy increases across a period as atomic size decrease 

Therefore, correct order is B < Be< C <O<N



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