Question
Question: The first element of rare-earth metal is :...
The first element of rare-earth metal is :
A
Cerium
B
Cesium
C
Lanthanide
D
Actinide
Answer
Cerium
Explanation
Solution
Lanthanide series Ž 58 to 71
Z = 58 Ž Cerium
The first element of rare-earth metal is :
Cerium
Cesium
Lanthanide
Actinide
Cerium
Lanthanide series Ž 58 to 71
Z = 58 Ž Cerium