I don't know about percentages, but since sea water has a lot of salt, I would expect that to be sodium and chlorine. (That is the common table salt; sea water also has some other salts.)
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Coordination number of an ion is the number of oppositely charged ions present around that ion as the neighbour ions , in that ionic crystal.
Na+ and Cl- are spectator ions.
The negative ions are chloride, bicarbonate, and phosphate
calcium ions that has lost electrons. It will give away electrons.
The arrangement of atoms or ions in a crystal.