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Yttrium, a rare earth metal, has a silver-grey color and metallic luster. It also appears highly crystalline. Yttrium displays chemical properties similar to those of rare earth elements. It dissolves in both mineral acids and alkalis, which are chemical opposites of one another.
When ionic compounds dissolve in water, the component ions dissociate and move about independently. What ions would be present in solutions K2Cr2O7 (potassium dichromate) and NH4Cl (Ammonium choride)?