Which of them effects lanthanide contraction?

Nuclear charge

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Screening effect

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Size

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Melting point

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Solution

The correct options are
A Nuclear charge
B Screening effect
D Size
Due to poor shielding effect (Screening effect) of 4f - subshell ,Net effective nuclear charges increases on 6s electrons.
Hence radius of lanthanides decreases from expected value.So, correct answer is A,B,C

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