8 - Oxygen diatomic nonmetal
Discovered by Carl Scheele in 1774
- 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.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 6 | 2 in 2s + 4 in 2p |
16 u
Atomic Mass
0.65 Å
Atomic Radius
90.2 K
Boiling Point
0.66 Å
Covalent Radius
1.43e-3 g/cm³
Density
140.98
Electron Affinity
3.44
Electronegativity
13.62 eV
First Ionization Energy
50.5 K
Melting Point
2
Number of Shells
6
Electron Valency
8
Atomic Number
2, 6
Electron Shell Occupations
0.92 J/(g K)
Specific Heat
