Introduction：Basic information about CAS 7440-59-7|helium, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.
| Common Name | helium |
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| CAS Number | 7440-59-7 | Molecular Weight | 4.00260 |
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| Density | 0.1785（0ºC） | Boiling Point | -268.934ºC(lit.) |
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| Molecular Formula | He | Melting Point | -272.2ºC(lit.) |
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| MSDS | / | Flash Point | none |
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Names
| Name | helium atom |
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| Synonym | More Synonyms |
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Chemical & Physical Properties
| Density | 0.1785（0ºC） |
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| Boiling Point | -268.934ºC(lit.) |
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| Melting Point | -272.2ºC(lit.) |
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| Molecular Formula | He |
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| Molecular Weight | 4.00260 |
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| Flash Point | none |
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| Exact Mass | 4.00260 |
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| Vapour density | 0.14 (vs air) |
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| InChIKey | SWQJXJOGLNCZEY-UHFFFAOYSA-N |
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| SMILES | [He] |
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| Stability | Stable; extremely unreactive. |
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Toxicological Information
CHEMICAL IDENTIFICATION - RTECS NUMBER :
- MH6520000
- CHEMICAL NAME :
- Helium
- CAS REGISTRY NUMBER :
- 7440-59-7
- LAST UPDATED :
- 199712
- DATA ITEMS CITED :
- 15
- MOLECULAR FORMULA :
- He
|
Safety Information
| Risk Phrases | R9 |
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| Safety Phrases | S9 |
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| RIDADR | UN 1046 |
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| WGK Germany | 3 |
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| RTECS | MH6520000 |
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| Hazard Class | 2.2 |
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| HS Code | 2804290000 |
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Customs
Synonyms
| EINECS 231-168-5 |
| helium |
| MFCD00011031 |
