氦
Hélium · Helium · Гелий · 헬륨 · Гелий · Hélio · Heliu · Хелијум · Helium · Гелий · Elio · هلیوم
| CAS | 7440-59-7 |
|---|---|
| EC | 231-168-5 |
| UN | 1963 |
| 分子式 | He |
| 摩尔质量 | 4.0026 g/mol |
| 气体或蒸气的相对密度（空气 = 1） | 0.138 |
| GHS | 警告 · H280, H281 |
Helium(0) is a monoatomic helium. It has a role as a NMR chemical shift reference compound and a member of food packaging gas. Helium appears as a colorless, odorless, noncombustible gas. Can asphyxiate. Inhalation causes the voice to become squeaky (Mickey Mouse voice).