Joseph Priestley is generally credited with discovering Oxygen in 1774.
It is the 3rd most abundant element in the universe.
Oxygen and its compounds make up 49.2% by weight of crust of the Earth.
Animals and plants cannot exist without Oxygen.
Oxygen is also responsible for combustion.
Ozone is a highly active form of Oxygen.
- Atomic Number: 8
- Atomic Weight: 16.00
- Melting Point: -218.40
- Boiling Point: -184.96
- Specific Gravity: 1.14 (liquid)
- Valence(s): -2
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