Nickel

Nickel, ₂₈Ni

Nickel
Appearance	Lustrous, metallic, and silver with a gold tinge
Standard atomic weight Ar°(Ni)
	58.6934±0.0004[1] 58.693±0.001 (abridged)[2]
Nickel in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Ni ↓ Pd cobalt ← nickel → copper
Atomic number (Z)	28
Group	group 10
Period	period 4
Block	d-block
Electron configuration	[Ar] 3d8 4s2 or [Ar] 3d9 4s1
Electrons per shell	2, 8, 16, 2 or 2, 8, 17, 1
Physical properties
Phase at STP	solid
Melting point	1728 K ​(1455 °C, ​2651 °F)
Boiling point	3003 K ​(2730 °C, ​4946 °F)
Density (at 20° C)	8.907 g/cm3 [3]
when liquid (at m.p.)	7.81 g/cm3
Heat of fusion	17.48 kJ/mol
Heat of vaporization	379 kJ/mol
Molar heat capacity	26.07 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1783 1950 2154 2410 2741 3184
Atomic properties
Oxidation states	common: +2 −2,? −1,[4] 0,? +1,[5] +3,[4] +4[6]
Electronegativity	Pauling scale: 1.91
Ionization energies	1st: 737.1 kJ/mol 2nd: 1753.0 kJ/mol 3rd: 3395 kJ/mol (more)
Atomic radius	empirical: 124 pm
Covalent radius	124±4 pm
Van der Waals radius	163 pm
Spectral lines of nickel
Other properties
Natural occurrence	primordial
Crystal structure	​face-centered cubic (fcc) (cF4)
Lattice constant	a = 352.41 pm (at 20 °C)[3]
Thermal expansion	12.83×10−6/K (at 20 °C)[3]
Thermal conductivity	90.9 W/(m⋅K)
Electrical resistivity	69.3 nΩ⋅m (at 20 °C)
Magnetic ordering	ferromagnetic
Young's modulus	200 GPa
Shear modulus	76 GPa
Bulk modulus	180 GPa
Speed of sound thin rod	4900 m/s (at r.t.)
Poisson ratio	0.31
Mohs hardness	4.0
Vickers hardness	638 MPa
Brinell hardness	667–1600 MPa
CAS Number	7440-02-0
History
Discovery and first isolation	Axel Fredrik Cronstedt (1751)
Isotopes of nickel v e
Main isotopes[7] Decay abun­dance half-life (t1/2) mode pro­duct 58Ni 68.1% stable 59Ni trace 7.6×104 y ε 59Co 60Ni 26.2% stable 61Ni 1.14% stable 62Ni 3.63% stable 63Ni synth 100 y β− 63Cu 64Ni 0.926% stable
Category: Nickel view talk edit | references

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,^[8][9] 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.^[10]

Use of nickel (as natural meteoric nickel–iron alloy) has been traced as far back as 3500 BCE. Nickel was first isolated and classified as an element in 1751 by Axel Fredrik Cronstedt, who initially mistook the ore for a copper mineral, in the cobalt mines of Los, Hälsingland, Sweden. The element's name comes from a mischievous sprite of German miner mythology, Nickel (similar to Old Nick). Nickel minerals can be green, like copper ores, and were known as kupfernickel – Nickel's copper – because they produced no copper.

Although most nickel in the earth's crust exists as oxides, economically more important nickel ores are sulfides, especially pentlandite. Major production sites include the Sudbury region, Canada (which is thought to be of meteoric origin), New Caledonia in the Pacific, Western Australia, and Norilsk, Russia.^[11]

Nickel is one of four elements (the others are iron, cobalt, and gadolinium)^[12] that are ferromagnetic at about room temperature. Alnico permanent magnets based partly on nickel are of intermediate strength between iron-based permanent magnets and rare-earth magnets. The metal is used chiefly in alloys and corrosion-resistant plating.

About 68% of world production is used in stainless steel. A further 10% is used for nickel-based and copper-based alloys, 9% for plating, 7% for alloy steels, 3% in foundries, and 4% in other applications such as in rechargeable batteries,^[13] including those in electric vehicles (EVs).^[14] Nickel is widely used in coins, though nickel-plated objects sometimes provoke nickel allergy. As a compound, nickel has a number of niche chemical manufacturing uses, such as a catalyst for hydrogenation, cathodes for rechargeable batteries, pigments and metal surface treatments.^[15] Nickel is an essential nutrient for some microorganisms and plants that have enzymes with nickel as an active site.^[16]