Transition metal oxidation states

  • Thread starter Moogie
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  • #1
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Hi

Why does Ni only form NiO with oxidation state of +2 whereas the other transition metals form a wide range of oxides with variable oxidation states

Thanks
 

Answers and Replies

  • #2
DrDu
Science Advisor
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It behaves the same way as do Zn and Copper which are its neighbours.
The reason is that the d-electrons shield each other only badly from the nuclear charge. Hence the effective nuclear charge increases (Google for Slater rules) when the number of d-electrons increases and the energy of the d-electrons relative to the valence s-electrons drops when going in the period from left to right so that they participate no longer in bonding at the end of the period.
 

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