Is in the lanthanide family A. Gold (Au) B. Silver (Ag) C. Uranium (U) D. Promethium (P?

D. Promethium (Pm) is the element in the lanthanide family. The lanthanides, also known as the rare earth elements, consist of 15 elements from lanthanum (La) to lutetium (Lu). Gold (Au), silver (Ag), and uranium (U) do not belong to this group.