- 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 u
Atomic Mass
50.5 K
Melting Point
90.2 K
Boiling Point
1.43e-3 g/cm³
Density
0.65 Å
Atomic Radius
0.66 Å
Covalent Radius
3.44
Electronegativity
13.62 eV
First Ionization Energy
140.98
Electron Affinity
2
Number of Shells
6
Electron Valency
2, 6
Electron Shell Occupations
0.92 J/g
Specific Heat