d and f-Block ElementsMedium
Question
Which of the following factors may be regarded as the main cause of lanthanide contraction?
Options
A.Poor shielding of one of 4f electron by another in the subshell
B.Effective shielding of one of 4f electrons by another in the subshell
C.Poorer shielding of 5d electrons by 4f electrons
D.Greater shielding of 5d electrons by 4f electrons
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