Which of the following factors may be regarded as the main cause of lanthanide contraction?A. Greater shielding of `5d` electrons by `4f` electrons.B. Poorer shielding of `5d` electron by `4f` electrons.C. Effective shielding of one of `4f` electrons by another in the sub-shell.D. Poor shielding of one of `4f` electron by another in the sub-shell

Which of the following factors may be regarded as the main cause of la

1.	Which of the following factors may be regarded as the main cause of lanthanide contraction?A. Greater shielding of `5d` electrons by `4f` electrons.B. Poorer shielding of `5d` electron by `4f` electrons.C. Effective shielding of one of `4f` electrons by another in the sub-shell.D. Poor shielding of one of `4f` electron by another in the sub-shell
Answer» Correct Answer - D Lanthanide contraction is due to poor shielding of one of `4f` electron by another in the sub-shell.

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