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Zn form only Zn^(2+) and not Zn^(3+), wh...

`Zn` form only `Zn^(2+)` and not `Zn^(3+)`, why?

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In the formation of `Zn^(3+)`, an electron from the `d^(10)` configuration has to be removed which requires abnormally higher amount of energy.
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