 |
| Name |
radium |
| Symbol |
Ra |
| Atomic Weight |
226.03 |
| Atomic Number |
88 |
| CAS ID |
7440-14-4 |
| Group Number |
2 |
| Group Name |
Alkaline Earth Metal |
| Period Number |
7 |
| Origin of Name |
Latin, radius = "ray" |
| Year Discovered |
1898 |
| Discovery Credits |
Pierre and Marie Curie at Paris, France. |
| Class |
Metallic |
| Color |
Metallic |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Radioactive element found naturally in
uranium and thorium ores. Silvery, lustrous, soft. Annual production 100
gm. Formerly used in cancer therapy and for luminous paint; both used now
rare. Reacts with oxygen and water. |
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