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(A) Statement $(a)$ is True $(T)$: Actinoid contraction is the steady decrease in the atomic and ionic radii of actinoids as the atomic number increas

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$(a) T, (b) F, (c) F$

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(A) Statement $(a)$ is True $(T)$: Actinoid contraction is the steady decrease in the atomic and ionic radii of actinoids as the atomic number increases,which becomes more pronounced from one element to the next.Statement $(b)$ is False $(F)$: Since the contraction is cumulative,it does not decrease; it is observed consistently across the series.Statement $(c)$ is False $(F)$: Actinoid contraction is a well-documented phenomenon,similar to lanthanoid contraction,caused by the poor shielding effect of $5f$ electrons.

List-$I$ (Property)	List-$II$ (Element)
$(A)$ Lanthanoid showing $+4$ oxidation state	$(i)$ $Pm$
$(B)$ Lanthanoid showing $+2$ oxidation state	$(ii)$ $Ce$
$(C)$ Radioactive lanthanoid	$(iii)$ $Lu$
$(D)$ Lanthanoid with $4f^7$ configuration in $+3$ state	$(iv)$ $Eu$
$(E)$ Lanthanoid with $4f^{14}$ configuration in $+3$ state	$(v)$ $Gd$
-	$(vi)$ $Dy$

Determine whether the following statements are True $(T)$ or False $(F)$:
$(a)$ Actinoid contraction increases from one element to the next.
$(b)$ Actinoid contraction decreases from one element to the next.
$(c)$ Lanthanoid contraction occurs,but actinoid contraction does not occur.

Similar Questions

Which of the following elements is not an actinoid?

Arrange the ions $Ce^{+3}, La^{+3}, Pm^{+3},$ and $Yb^{+3}$ in the increasing order of their ionic radii.

The correct order of ionic radii of $Ce, La, Pm$ and $Yb$ in $+3$ oxidation state is:

Which of the following elements can form compounds in $+3$ to $+7$ oxidation states?

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Determine whether the following statements are True $(T)$ or False $(F)$:$(a)$ Actinoid contraction increases from one element to the next.$(b)$ Actinoid contraction decreases from one element to the next.$(c)$ Lanthanoid contraction occurs,but actinoid contraction does not occur.