Which one of the following sets consists entirely of d-block elements?

ACe, Nd, Eu
BHf, Ta, W
CTh, U, Pu
DPb, Bi, Po

Answer: B

Hf (5d2 6s2), Ta (5d3 6s2) and W (5d4 6s2) are all d-block. Ce, Nd and Eu are lanthanoids (f-block), Th, U and Pu are actinoids (f-block), and Pb, Bi and Po are p-block.

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