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Nickel
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Chemical element with atomic number 28 (Ni)
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Wikipedia

Nickel is a chemical element; it has 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 react with air under standard conditions because a passivation layer of nickel oxide that prevents...

Instance of
Chemical element
Subclass of
Allergen
Material
References
Wikidata