why sea water contains chlorides bromides and iodides of only Na K Mg and Ca?

Dear Student,

Please find below the solution to the asked query:

Sea water consists primarily of NaCl, and other chlorides of Mg, Iodides of Ca, Mg, and Na. This is because these are alkali and alkaline earth metals which are very soluble when combined with chlorides, bromides and  iodides. The complexes formed are soluble in sea water and the hydrated Magnesium chloride present in sea water can be easily extracted from sea water [  which is primarily composed of  NaCl.] and thus they donot remain suspended as impurities. Moreover the compounds formed by combination of these metals with chlorides bromides and iodides are non-toxic in nature.This makes them fit for the aquatic life also. 

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