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NI-nickel.
Brief description: nickel is found as a constituent in most meteorites and often serves as one of the criteria for distinguishing a meteorite from other minerals. Iron meteorites, or siderites, may contain iron alloyed with from 5 to nearly 20% nickel. The USA 5-cent coin (whose nickname is "nickel") contains just 25% nickel. Nickel is a silvery white metal that takes on a high polish. It is hard, malleable, ductile, somewhat ferromagnetic, and a fair conductor of heat and electricity.
•Name: Nickel •Symbol: Ni •Atomic number: 28 •Atomic weight: 58.6934 (4) •Standard state: solid at 298 K •CAS Registry ID: 7440-02-0 •Group in periodic table: 10 •Group name: (none) •Period in periodic table: 4 •Block in periodic table: d-block •Colour: lustrous, metallic, silvery tinge •Classification: Metallic
Isolation: it is not normally necessary to make nickel in the laboratory as it is available readily commercially. Small amounts of pure nickel can be islated in the laborotory through the purification of crude nickel with carbon monoxide. The intermediate in this process is the highly toxic nickel tetracarbonyl, Ni(CO)4. The carbonyl decomposes on heating to about 250C to form pure nickel powder.
Appearance: Hard, malleable, silvery-white metal Atomic Radius (pm): 124 Atomic Volume (cc/mol): 6.6 Covalent Radius (pm): 115 Ionic Radius: 69 (+2e) Specific Heat (@20C J/g mol): 0.443 Fusion Heat (kJ/mol): 17.61 Evaporation Heat (kJ/mol): 378.6 Debye Temperature (K): 375.00 Pauling Negativity Number: 1.91 First Ionizing Energy (kJ/mol): 736.2 Oxidation States: 3, 2, 0 Lattice Structure: Face-Centered Cubic Lattice Constant (): 3.520
The nickel was discovered by Axel Fredrik Cronstedt (SE) in 1751. The origin of the name comes from the German word kupfernickel meaning Devil's copper or St Nicholas's (Old Nick's) copper. It is a hard, malleable, silvery-white metal. Nickel is soluble in acids, resist alkalis. It can be polished to a lustrous finish. It resists corrosion in air under normal conditions. Nickel is 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. Nickel is used in electroplating and metal alloys because of its resistance to corrosion, in nickel-cadmium batteries, and as a catalyst and for coins.
