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

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.