(a) What is the most stable oxidation state of nickel in acidic solution? (b) Show a balanced equation for a possible comproportionation reaction of nickel species in basic solution.

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d-Block Elements

According to the modern form of periodic table, 118 elements are present which are subdivided as four blocks, namely, s, p, d and f-block elements based on the entry of the valence electron or last electron into which orbital.