 |
| Name |
actinium |
| Symbol |
Ac |
| Atomic Weight |
227.03 |
| Atomic Number |
89 |
| CAS ID |
7440-34-8 |
| Group Number |
|
| Group Name |
Actinoid |
| Period Number |
7 |
| Origin of Name |
From the Greek,
aktinos = "ray." |
| Year Discovered |
1899 |
| Discovery Credits |
Discovered by A. Debierne at Paris, France. |
| Class |
Metallic |
| Color |
Silvery |
| Standard State |
Solid at 77 F & 298 K |
| Description |
Soft, Silvery-white
metal which glows in the dark. Reacts with water to evolve H2.
Primarily occurs as a trace amount (a few ppm) in uranium minerals where it is a decay
product of U238
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