Which of the following factor may be regarded as the main cause of lanthanoids contraction?
(a) ... VIDEO
Which of the following factor may be regarded as the main cause of lanthanoids contraction?
(a) Poor suielding of one of the \( 4 f \)-electrons by another in the subshell.
(b) Effective shielding of one of the \( 4 f \)-electrons by another in the subshell.
(c) Poorer shielding of \( 5 d \)-electrons by \( 4 f \)-electrons.
(d) Greater shielding of \( 5 d \)-electrons by \( 4 f \)-electrons.
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