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Out of the following outer electronic co...

Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one?

A

`(n-1)d^(8)ns^(2)`

B

`(n-1)d^(5)ns^(2)`

C

`(n-1)d^(3)ns^(2)`

D

`(n-1)d^(5)ns^(1)`

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