Lanthanide contraction is due to increase in (a) shielding by \( 4 \mathrm{f} \) electrons (b) a...

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Lanthanide contraction is due to increase in
(a) shielding by \( 4 \mathrm{f} \) electrons
(b) atomic number
(c) effective nuclear charge
(d) size of 4 f orbitals
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