Helium (He)
The gas that makes balloons float and voices squeaky.
Helium facts
- Symbol
- He
- Atomic number
- 2
- Atomic mass
- 4.0026
- Family
- Noble gases
- Period
- 1
- Group
- 18
What does helium react with?
In our lab helium doesn't make any new substances when it's simply mixed with the others.
Nothing happens when it's simply mixed with 98 of the others. 21 pairings have never been tried, because not enough atoms have ever existed.