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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.

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.

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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.