I believe that the ionic state of Cadmium refers to the most likely ion(s) that Cadmium will form. You can find these numbers by looking at the number of electrons in the valence (outer) shell. The ion is either looking to give away it’s electrons (giving it a positive charge) or take other atoms electrons (giving it a negative charge) to form an octet or 8 electrons in it’s outer shell. Cadmium has 2 electrons in it’s outer shell that it would be willing to give up, forming an Ionic state of 2+
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