Oxygen, O
Oxygen is a gas in group VIA of the periodic table with atomic number 8 and an atomic weight of 15.9994. The material liquifies at - 183 C and solidifies at 
- 218.8 C with a cubic crystal structure.

Oxygen has the electronic configuration: (1s)2(2s)2(2p)4, and an atomic radius of 0.073 nm.