 |
| Name |
helium |
| Symbol |
He |
| Atomic Weight |
4.002602 |
| Atomic Number |
2 |
| CAS ID |
7440-59-7 |
| Group Number |
18 |
| Group Name |
Noble Gas |
| Period Number |
1 |
| Origin of Name |
Greek, helios = "sun." |
| Year Discovered |
1895 |
| Discovery Credits |
Isolated in 1895 by Sir William Ramsay at London, UK, and
independently by P. T. Cleve and N. A. Langlet at Uppsala, Sweden. |
| Class |
Non-Metallic |
| Color |
Colorless |
| Standard State |
Gas at 77 F & 298 K |
| Description |
Colorless, odorless gas. Unreactive chemically. Used in
deep-sea diving, weather balloons, and low temperature research
instruments. Most natural sources of helium come from natural gas deposits
where He is present from the alpha particle decay of heavy radioisotopes
of U and Th and their daughter products. |
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