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Ionization energy decreases as we move down the group. But moving down from the second to the third transition series ionization energy increases except for Y to La. This is due to:
  1. lanthanide contraction
  2. change in the electronic configuration
  3. all of the above
  4. poor screening of d-electrons


Solution

The correct option is A lanthanide contraction
Due to Lanthanide contraction, the ionization energy increases from the second to the third transition series. Lanthanide contraction is due to the poor shielding of  4f electrons.

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