Which of the following factors may be regarded as the main cause of lanthanide contraction [AIEEE 2005]

Effective shielding of one of \[4f\] electrons by another in the subshell

Poor shielding of one of \[4f\] electron by another in the subshell

Poorer shielding of \[5d\] electrons by \[4f\] electrons

Greater shielding of \[5d\] electron by \[4f\] electrons

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 [AIEEE 2005]
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 \[5d\] electron by \[4f\] electrons
Answer» B. Effective shielding of one of \[4f\] electrons by another in the subshell

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