Of the more than 70 different ions that are dissolved in seawater the two most abundant

The most abundant compound that can be found in the sea apart from water is the sodium chloride (NaCl). This is why we are able to retrieve table salt, which also comes in the same formula, from the sea. When sodium chloride dissociates into its ions, the two ions would be Na+ and Cl- which are called sodium ion and chloride.