CAS Number7440-02-0
PubChem CID935
Atomic Radius124
Atomic Volume6.59
Atomic Weight58.693
Boiling Point2,913
Bulk Modulus
CategoryTransition metals
Crystal StructureFace Centered Cubic
Covalent Radius124
Electrical Resistivity
Electron Configuration[Ar] 3d8 4s2
Electrons per shell2, 8, 16, 2
Heat of Fusion17.2
Heat of Vaporization378
Ionization Potential7.64
Magnetic Ordering
Magnetic Susceptibility
Mass Number28
Melting Point1,455
Atomic Number59
Oxidation States-1, 1, 2, 3, 4
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.444
Thermal Conductivity0.907
Van der Waals radius
Young's Modulus
Abundance in Earth's crust0.0089%
Abundance in Universe0.006%
Ni Nickel 28 58.6934 10 4 d 28 1453.0 2730.0 [Ar] 3d8 4s2 2 8 16 2 8.9 0.0089% Gray Cubic: Face centered 1.9 1.88 {"1":"737.1","2":"1753.0","3":"3395","4":"5300","5":"7339","6":"10400","7":"12800","8":"15600","9":"18600","10":"21670","11":"30970","12":"34000","13":"37100","14":"41500","15":"44800","16":"48100","17":"55101","18":"58570","19":"148700","20":"159000","21":"169400","22":"182700","23":"194000","24":"205600","25":"221400","26":"231490","27":"992718","28":"1039668"} 737 112 121 +2,3 1.24 6.6 17.2 377.5 0.444 90.7 0 Solid, Ferromagnetic, Conductor, TransitionMetal, Metal, Stable, Natural NIK-l Hard, malleable, silvery-white metal. Found in the earth's crust in portions averaging 70 ppm. It can be polished to a lustrous finish. Virtually no corrosion under normal conditions. Used in electroplating and metal alloys because of its resistance to corrosion. Also in nickel-cadmium batteries; as a catalyst and for coins. Chiefly found in pentlandite [(Ni,Fe)9S8] ore. The metal is produced by heating the ore in a blast furnace which replaces the sulfur with oxygen. The oxides are then treated with an acid that reacts with the iron not the nickel. t4kRHoj0W1Y Nickel
Argon was suspected to be present in air by Henry Cavendish in 1785.

It was not isolated until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland.

Argon became the first member of the noble gases to be discovered.

In 1957, IUPAC agreed that the symbol should change from A to Ar. From the Greek argos, inactive 28 1751 Axel Fredrik Cronstedt Sweden From the German word "kupfernickel" meaning Devil's copper or St Nicholas's (Old Nick's) copper

Isotopes of Argon

Standard Atomic Weight


Stable Isotopes

58Ni 60Ni 61Ni 62Ni 64Ni

Unstable Isotopes

48Ni 49Ni 50Ni 51Ni 52Ni 53Ni 54Ni 55Ni 56Ni 57Ni 59Ni 63Ni 65Ni 66Ni 67Ni 68Ni 69Ni 70Ni 71Ni 72Ni 73Ni 74Ni 75Ni 76Ni 77Ni 78Ni

Argon is considered to be non-toxic
Argon makes a distinctive blue-green gas laser
Argon gas is used to fill conventional incandescent and fluorescent light bulbs.

Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements.

It is used as a protective atmosphere for growing silicon and germanium crystals.