Nickel oxide may refer to:
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Nickel(II) oxide
Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive but large pieces are slow to r ...
, NiO, green, well-characterised oxide
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Nickel(III) oxide, Ni
2O
3, black, not well-characterised oxide
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Oxonickelates
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