A) the earlier members of lanthanoid series resemble calcium in their chemical properties.
B) the extent of actinoid contraction is almost the same as lanthanoid contraction.
C) in general, lanthanoids and actinoids do not show variable oxidation states.
D) \[C{{e}^{4+}}\] in aqueous solution is not known.
Correct Answer: A
Solution :
the earlier members of lanthanoid series resemble calcium in their chemical properties.
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