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Classification of Elements and Periodicity in Properties
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23/08/2021 1:47 pm
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Correct order of first IP among following elements Be, B, C, N, O is
(a) B < Be < C < O < N
(b) B < Be < C < N < O
(c) Be < B < C < N < O
(d) Be < B < C < O < N
1 Answer
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23/08/2021 1:59 pm
Correct answer: (a) B < Be < C < O < N
Explanation:
Be – 1s22s2 ; B – 1s2 2s2 2p1; C – 1s2 2s2 2p2; N – 1s2 2s2 2p3; O – 1s2 2s22p4.
IP increases along the period. But IP of Be > B. Further IP of O < N because atoms with fully or partly filled orbitals are most stable and hence have high ionisation energy.