Now a day, the Rare Metals are becoming more important because the industry necessities. Usually, these elements are an important component in the fabrication of aerospace components, microwave filters, battery-electrodes, camera lenses, lasers, ceramic capacitors, nuclear batteries, X-ray machines, etc.
The rear earth metals are a set of seventeen chemical elements, that are classified in the Periodic Table like the lanthanides and also scandium and yttrium1. The seventeen elements are listed below.
|
Atomic Number |
Symbol |
Name |
|
21 |
Sc |
Scandium |
|
39 |
Y |
Yttrium |
|
57 |
La |
Lanthanum |
|
58 |
Ce |
Cerium |
|
59 |
Pr |
Praseodymium |
|
60 |
Nd |
Neodymium |
|
61 |
Pm |
Promethium |
|
62 |
Sm |
Samarium |
|
63 |
Eu |
Europium |
|
64 |
Gd |
Gadolinium |
|
65 |
Tb |
Terbium |
|
66 |
Dy |
Dysprosium |
|
67 |
Ho |
Holmium |
|
68 |
Er |
Erbium |
|
69 |
Tm |
Thulium |
|
70 |
Yb |
Ytterbium |
|
71 |
Lu |
Lutetium (Paris) |
(1) N.G.Connelly, T. D., R.M. Hartshorn and A.T. Hutton Cambridge: RSC Publ. 2005.
