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Reason of lanthanoid contraction is
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By Expert Faculty of Sri Chaitanya
a
negligible screening effect of ' f' -orbitals
b
increasing nuclear charge
c
decreasing nuclear charge
d
decreasing screening effect
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Correct option is A
Due to poor shielding effect of 4f-orbitals, nucleus will exert a strong attraction and size of atom or ion goes on decreasing as move in the series with increase in atomic number.
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