Among the second period elements the actual ionization enthalpies are in the order Li < B < Be < C < O < N < F < Ne. Explain why
(i) Be has higher ∆iH than B
(ii)O has lower ΔiH than N and F?
The first ionization enthalpies for three elements are 1314, 1680, and 2080 kJ mol−1, respectively. The correct sequence of the elements is