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CUET Preparation Today
Lanthanoid contraction is caused due to which of the following? |
The appreciable shielding of outer electrons by 4f electrons from nuclear charge. The appreciable shielding of outer electrons by 4d electrons from nuclear charge. The same effective nuclear charge from Ce to Lu. The imperfect shielding on outer electrons by 4f electrons from the nuclear charge. |
The imperfect shielding on outer electrons by 4f electrons from the nuclear charge. |
Cause of Lanthanide Contraction: The effect of lanthanide contraction results from the poor shielding of nuclear charge (with the attractive nuclear force on electrons) by 4f electrons; the 6s electrons can be drawn towards the nucleus, hence resulting in a smaller atomic radius. |
