- Atomic Radius (Å)
Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds (notably oxides) with most elements. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium.
8
Atomic Number
16
Atomic Mass (u)
50.5
Melting Point (K)
90.2
Boiling Point (K)
1.43
Density (solid: g/cm³, gas: g/liter)
0.65
Atomic Radius (Å)
0.66
Covalent Radius (Å)
3.44
Electronegativity
13.62
First Ionization Energy (eV)
140.98
Electron Affinity
2
Number of Shells
6
Electron Valency
2, 6
Electron Shell Occupations
0.92
Specific Heat (J/g)