Which ion is not found in sea water in a concentration high enough to be an industrial source of the metal?

Name: Which ion is not found in sea water in a concentration high enough to be an industrial source of the metal?
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Question

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Silver (Ag) is not found in seawater in high enough concentrations to make it an industrial source of the metal. The other ions listed are all found in seawater in significant quantities and can be sources of their respective metals.

Which Ion Is Not Found in Sea Water in a Concentration