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How can you tell that cobalt(II) iodide is binary ionic compound formed by a transition metal with more than ionic charge? Thanx in Advance form jeff

Cobalt(II) chloride tells you it is binary (composed of two different atoms), cobalt and iodine; compare the electronegativity of Co and I to determine if it is ionic; cobalt is in the 3d (period 3) of the periodic table and that is the 3d transition series of metals. I don't know what you mean by more than ionic charge>