Question

question 4 of 25 which element is in the lanthanide family? a. silver (ag) b. promethium (pm) c. gold (au) d. uranium (u)

Explanation:

The lanthanide series consists of 15 metallic chemical elements with atomic numbers 57 - 71. Promethium (Pm) with atomic number 61 is part of the lanthanide family. Silver is a transition - metal, gold is a transition - metal, and uranium is an actinide.

Answer:

B. Promethium (Pm)