Question

which of the following is a lanthanide? a. americium (am) b. barium (ba) c. europium (eu) d. gold (au)

Explanation:

Lanthanides are a series of 15 metallic chemical elements with atomic numbers 57 - 71. Europium has an atomic number of 63 and is part of the lanthanide series. Americium is an actinide, barium is an alkaline - earth metal, and gold is a transition metal.

Answer:

C. Europium (Eu)