Lanthanoid Contraction occurs due to poor shielding by electrons present in f-subshells.

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Q. Lanthanoid Contraction occurs due to poor shielding by electrons present in f-subshells.

From element to element, the actinoid contraction is greater than the lanthanoid contraction due to poor shielding by 5f-electrons in actinoids than that by 4f-electrons in the lanthanoids.

Q. The Lanthanide Contraction is the result of the poor shielding effect of

5 d

electrons

Q. Consider the given statements in general and mark the correct statements out of the following.

(SI) : The contraction in transition series is attributed to the imperfect shielding of one electron by another in the same subshell.

(SII) : The shielding of one $f$ electron by another is less than that of one d electron by another with the increase in nuclear charge along the series in the same subshell.

(SIII) : As a result of Lanthanoid contraction,

Z r

and

H f

have almost identical radii which accounts for their occurrence together in nature and for difficulty faced in their separation.

(SIV) : The size of lanthanoid ions in

+ 3

state smoothly increases as their atomic number increases.

Q. Lanthanoid contraction occurs because

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