2He
Helium
Noble gas
Properties of Helium
- Atomic number (Z)
- 2
- Symbol
- He
- Name
- Helium
- Atomic mass
- 4.003 u
- Period
- 1
- Group
- 18
- Family
- Noble gases
- Classification
- Noble gas
- Electron configuration
- 1s²
About Helium
Helium is a chemical element with symbol He and atomic number 2 (atomic mass of about 4.003 u). It is classified as a noble gas on the periodic table.
On the periodic table, Helium is located in period 1, in group 18, belonging to the noble gases family. An element's position reveals trends in its properties, such as atomic radius, electronegativity and metallic character.
The electron configuration of Helium is 1s², which determines how it forms chemical bonds and takes part in reactions.