A) Curium
B) Californium
C) Erbium
D) Amercium
Correct Answer: C
Solution :
The lanthanide or lanthanoid is the series of chemical elements. It comprises the fifteen metallic chemical elements with atomic number 57 through 71 from lanthanum through lutetium. Erbium \[\left( z=68 \right)\] is a lanthanide while other three are actinide.
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