Name one metal ion that's not multivalent.

Hydrogen?

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I understand

Nevertheless perhaps Hydrogen is correct :)

No, hydrogen is not correct but you get 50% for thinking of it; i.e., that's a close answer. Actually, H has a valence of +1 in most compounds but in hydrides it is -1 (as in LiH or NaH or CaH2).

I would pick any element in group I.

Thank you both very much for your assistance

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Actually, hydrogen is not considered a metal ion as it is not a metal and does not typically form cations. However, I can provide you with an example of a metal ion that is not multivalent.

An example of a metal ion that is not multivalent is silver (Ag+). Silver is a transition metal that typically forms a monovalent cation with a charge of +1. This means that in chemical reactions, silver loses one electron to acquire a stable electronic configuration and forms the Ag+ ion.

To determine if a metal ion is multivalent or not, you can refer to the periodic table or chemical literature. Multivalent metal ions are typically transition metals and can have different positive charges depending on the specific compound or oxidation state. On the other hand, monovalent metal ions have a fixed charge and are not multivalent.