Classification of Elements and Periodicity in Properties - Result Question 31

####31. Correct order of first IP among following elements Be, B, C, N, O is

[2001]

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

(b) B<Be<C<N<O

(c) Be< B < C <N<O (d)

(d) Be<B<C<O<N

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Solution:

  1. (a) Be1s22s2;B1s22s22p1;C1s22s22p2; N1s22s22p3;O1s22s22p4. 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.


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