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Oxygen - 85.84% Hydrogen - 10.82%

Chlorine - 1.94%

Sodium - 1.08%

Magnesium - 0.1292%

Sulfur - 0.091%

Calcium - 0.04%

Potassium - 0.04%

Bromine - 0.0067%

Carbon - 0.0028%

The main ones are Oxygen. Hydrogen, Chlorine and Sodium.

If you are looking for more information on this topic click on this link:

http://en.wikipedia.org/wiki/Seawater

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