Classification of Elements and Periodicity in Properties

Classification of Elements and Periodicity in Properties

Question

In which of the following arrangements the order is NOT according to the property indicated against it?

  • Al3+ < Mg2+ < Na+ < F- Increasing ionic size

  • B < C < N < O Increasing first ionization enthalpy

  • I < Br < F < Cl Increasing electron gain enthalpy (with negative sign)

  • Li < Na < K < Rb Increasing metallic radius

Answer

B.

B < C < N < O Increasing first ionization enthalpy

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