1.

Lanthanide contraction is due to ___

Answer»

IMPERFECT SHIELDING an outer electrons by 4f electrons from the NUCLEAR charge.
effective shielding by 4f electron on the VALENCE shell electrons
greater shielding of 5d electrons by 4f electrons from the nuclear charge
appreciable shielding on outer electrons by 4f electrons from the nuclear charge

Answer :A


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