Periodic trends – ionisation enthalpy, electron gain enthalpy, radii

2016 1 question

1. 1 Classification of Elements and Periodicity in Properties
   In which of the following options the order of arrangement does not agree with the variation of property indicated against it?
   A B < C < N < O (increasing first ionisation enthalpy). B I < Br < Cl < F (increasing electron gain enthalpy). C Li < Na < K < Rb (increasing metallic radius). D $Al^{3+} < Mg^{2+} < Na^+ < F^-$ (increasing ionic size).
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