1 image

Nickel

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 forms on the surface that prevents further corrosion. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickel???iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. An iron???nickel mixture is thought to compose Earth's outer and inner cores. Use of nickel (as natural meteoric nickel???iron alloy) has been traced as far back as 3500 BCE. Nickel was...

e: 2000000000000060314

wikidata.org 0 views · 2024-12-26 22:02:01