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Reason of lanthanoid contraction isA. negligible screening effect of f-orbitalsB. increasing nuclear changeC. decreasing nuclear chargeD. decreasing screening effect |
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Answer» Correct Answer - A Lanthanoid contraction is the regular decrease in atomic and ionic radii of lanthanides. This is due to the imperfect shielding [or poor screening effect] of f-orbitals due to thieir diffused shape which unable to counterbalance the effect to the increased nuclear charge. Hence, the net results is a contraction in size of lanthanoids. |
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