7440-59-7
7440-59-7 structure
- Name: helium
- Chemical Name: helium atom
- CAS Number: 7440-59-7
- Molecular Formula: He
- Molecular Weight: 4.00260
- Catalog: Inorganic chemical industry Industrial gases such as hydrogen, nitrogen and oxygen
- Create Date: 2018-02-05 08:00:00
- Modify Date: 2025-08-20 10:22:56
| Name | helium atom |
|---|---|
| Synonyms |
EINECS 231-168-5
helium MFCD00011031 |
| Density | 0.1785（0ºC） |
|---|---|
| Boiling Point | -268.934ºC(lit.) |
| Melting Point | -272.2ºC(lit.) |
| Molecular Formula | He |
| Molecular Weight | 4.00260 |
| Flash Point | none |
| Exact Mass | 4.00260 |
| Vapour density | 0.14 (vs air) |
| Stability | Stable; extremely unreactive. |
CHEMICAL IDENTIFICATION
|
| Risk Phrases | R9 |
|---|---|
| Safety Phrases | S9 |
| RIDADR | UN 1046 |
| WGK Germany | 3 |
| RTECS | MH6520000 |
| Hazard Class | 2.2 |
| HS Code | 2804290000 |
| HS Code | 2804290000 |
|---|