A) short periods
B) inner-transition elements
C) long periods
D) main transition elements
Correct Answer: B
Solution :
Lanthanides and actinides contains partially filled\[f-\]subshell of the antipenultimate (inner to the penultimate shell, ie,\[n-2\]) shell, so these are known as\[f-\]block elements or inner-transition elements.
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