The reason behind the lower atomic radius of Ga as compared to Al is

Chemistry · JEE Main · NTA Examsp-Block Elements

The reason behind the lower atomic radius of Ga as
compared to Al is
  1. poor screening effect of d-electrons for the outer
    electrons from increased nuclear charge
  2. increased force of attraction of increased nuclear
    charge on electrons
  3. increased ionisation enthalpy of Ga as compared to
    Al
  4. anomalous behaviour of Ga.

Answer

(A) poor screening effect of d-electrons for the outer electrons from increased nuclear charge

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