It's a solution!!!!
No, it is a mixture of a number of different compound. Water itself is a compound. Ocean water is not pure water though.
sodium chloride
Ocean water is a mixture.
Calcium.
No, it is the most common dissolved ion in the ocean. The most common element by mass is oxygen as the ocean is still mostly water.
calcium
Nitrogen
Hydrogen and Oxygen H20 is the element compound of water.
Hydrogen and Oxygen H20 is the element compound of water.
I think that it is a Mixture because it is salt + water evenly mixed together.
namely Hydrogen, Oxygen, Sodium, Chlorine and some others