A) negligible screening effect of T orbitals
B) increasing nuclear charge
C) decreasing nuclear charge
D) decreasing screening effect
Correct Answer: D
Solution :
| [d] 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 their diffused shapewhich unable to counterbalance the effect of the increased nuclear charge. |
| Hence the net result is a contraction in size of lanthanoids. |
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