Elements / 2
2He4.0026
Helium
Noble gas · s-block · ring K · spoke 18
Helium is element 2, a noble gas. Helium sits beside hydrogen at the center, at the root of the noble gas spoke. On the standard table it has to be moved across to group 18; here it is simply next on the path.
Properties
| Density | 0.179 g/L (as a gas) | Terrain → |
|---|---|---|
| Melting point | Not measured | Terrain → |
| Boiling point | 4 K · -269 °C | Terrain → |
| Electronegativity | Not measured | Terrain → |
| First ionization energy | 2,372 kJ/molThe highest ionization energy of 103 | Terrain → |
| Atomic weight | 4.0026 u | Terrain → |
| Crustal abundance | 0.008 ppm | Terrain → |
| Discovered | 1868 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- First recorded as a spectral line in sunlight on August 18, 1868, it was not isolated on Earth until 1895.
- Named after the Greek word for the Sun; it is the well-known lifting gas in balloons and airships.
Checked against en.wikipedia.org.
Spoke 18: Noble gases
Ring K (period 1)
Play with Helium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.