Helium is an exceptionally unreactive, low-density gas formed abundantly by stellar fusion and radioactive decay.
Atomic number
2
Category
Noble gas
Period
1
Group
18
State
Gas
Fun facts about Helium
It remains liquid at temperatures close to absolute zero.
Its low solubility makes it useful in deep-diving breathing mixtures.
Alpha particles become helium atoms after gaining electrons.
Common uses of Helium
Cooling superconducting magnets
Leak detection
Lifting gas
Where Helium sits in the periodic table
Helium is classified as a noble gas in period 1 and group 18 of the periodic table. Under the conditions represented in this reference, its state is gas.
Quick chemistry revision
For quick revision, pair the symbol He with atomic number 2 and the listed atomic mass 4.0026. The summary, facts, and uses above keep those element properties together in one reference.