Which of the following is a lanthanide ?
| A. |
Curium |
| B. |
Californium |
| C. |
Erbium |
 |
| D. |
Americium |
The lantanide or lanthanoid is the series of chemicl elements. It comprises the fifteen metallic chemical elements with atomic number 57 through 71 from lanthanum lutetium. Erbium (z = 68) is a lanthanide while other three are actinide.