JEE Main Chemistry question

Lanthanoids and actinoids resemble in:

(A)Electronic configurationCorrect
(B)Oxidation state
(C)Ionisation energy
(D)Formation of complex

Answer: (A)

Solution

Both series share the general pattern of filling an inner -subshell ( for lanthanoids, for actinoids) while the outer shell configuration stays essentially unchanged, giving

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Question ID VK-147651