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Which of the following factor may be reg...

Which of the following factor may be regarded as the main cause of lanthanide contraction?

A

Poor shielding of one of the 4f-electrons by another in the subshell

B

Effective shielding of one of the 4f-electrons by another in the subshell

C

Poorer shielding of 5d electrond by 4f electrons

D

Greater shielding of 5d electrons by 4f electrons.

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The correct Answer is:
a
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