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Atomic number, ionic radius, electronegativity, and ionization potential of the investigated bivalent metal iona.
| Metal ion | Co2+ | Ni2 | Cu2+ | Zn2+ |
|---|---|---|---|---|
| Atomic number | 27 | 28 | 29 | 30 |
| Ionic radius (pm) | 79 | 72 | 71 | 74 |
| Electronegativity | 1.88 | 1.91 | 2.00 | 1.65 |
| Second ionization energy (kJ/mol) | 1646 | 1753 | 1958 | 1733 |
aValues from [30].
