After oxygen and hydrogen, which element is most abundant in ocean water (by mass)?

Chlorine the salt in Nacl

Explanation:

First is the oxygen at 85.84%, and second is the hydrogen at `10.82% then,  comes the chlorine at the 1.94%. Followed by a sodium of 1%. This is commonly referred to as the sea salt and is highly present in the acidic and alkaline water in a diluted form and is about the 35 g of salt an abundant water resource.

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