He
| Atomic Number: | | 2 | |
| Atomic Weight: | | 4 | |
| State at STP: | | gas | PreviousHydrogen |
| Density: | | 0.18 g/cc | |
| Melting Point: | | -272 °C | Next Beryllium |
| Boiling Point: | | -269 °C | |
| % of Earth's Crust: | | | |
| Year Discovered: | | 1895 | |
| Electron Configuration: | | 1s2 | |
| Ionization Energy: | | 24.59 (eV) | |
| Heat of Fusion: | | 0.02 kilojoules/mole | |
| Atomic Volume: | | 31.8 cubic centimeters/mole | |
| Specific Heat Capacity: | | 5.19 Joules/gram/degree Kelvin | |
| Radio Active: | | No | |
| Wikipedia Article: | | en.wikipedia.org/wiki/Helium | |
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