The correct statement about the lanthanoids is:

Question

Canvas Classes · Accepted Answer

Checking each statement:

A. All lanthanoids are radioactive — FALSE ✗

Only Pm (Z=61) is radioactive among lanthanoids. All others are stable.

B. All lanthanoids are strongly paramagnetic — TRUE ✓

Most lanthanoids have unpaired 4f electrons → paramagnetic. Exceptions:  () and  () are diamagnetic, but as elements (not ions), they have unpaired electrons.

Actually, the statement is broadly correct — lanthanoid elements and most of their ions are paramagnetic due to 4f electrons.

C. All show +

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