why is nickel 3+ unstable
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Nickel has five stable isotopes that occur naturally including nickel-58, 60, 61, 62, and 64. The most abundant isotope is nickel-58. Nickel exists in oxidation states of -1 to +4....
Nickel is not a reactive metal. It dissolves slowly in acids. It does not rust like iron. It makes a thin coating of nickel(II) oxide which stops more corrosion
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because it requires 8 electrons in its outermost shell for stable but there are only 3 electrons that's why nickel 3+ is unstable
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