Helium is a noble gas and the second lightest element in the periodic table. It is an inert, colorless and odorless gas that is used in many industrial and scientific applications. In particular, it is used in cryogenics, welding, and as a coolant in nuclear reactors.
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| Atomic number | 2 |
| Group | VIIIA |
| Period | 1 |
| Mass | 4.002602 |
| Latin name | Helium |
| Electron configuration | 1s2 |
| Oxidation state | 0 |