Periodic Properties

The set representing the correct order of ionic radius is

  1. Li+ > Na+ > Mg2+ > Be2+
  2. Na+ > Li+ > Mg2+ > Be2+
  3. Li+ > Be2+ > Na+ > Mg2+
  4. Mg2+ > Be2+ > Li+ > Na+

Answer

Na+: 1.02 Ao

Be2+: 0.39 Ao

Mg2+: 0.72 Ao

Li+: 0.76 Ao

The correct option is B.