الوصف

Zinc, in commerce also spelter, is a metallic chemical element; it has the symbol Zn and atomic number *0. It is the first element of group *2 of the periodic table. Zinc is, in some respects, chemically similar to magnesium, because its ion is of similar size and its only common oxidation state is *2. Zinc is the *4th most abundant element in the Earth's crust and has five stable isotopes. The most common zinc ore is sphalerite (zinc blende), a zinc sulfide mineral. The largest mineable amounts are found in Australia, Asia, and the United States. Zinc production includes froth flotation of the ore, roasting, and final extraction using electricity (electrowinning).
 
Physical properties
 
Zinc, also referred to in nonscientific contexts as spelter,is a bluish-white, lustrous, diamagnetic metal,though most common commercial grades of the metal have a dull finish.It is somewhat less dense than iron and has a hexagonal crystal structure.
 
The metal is hard and brittle at most temperatures but becomes malleable between **0 and **0 °C.Above **0 °C, the metal becomes brittle again and can be pulverized by beating. Zinc is a fair conductor of electricity.[6] For a metal, zinc has relatively low melting (**9.5 °C, **7.1 F) and boiling points (**7 °C). Its melting point is the lowest of all the transition metals aside from mercury and cadmium.
 
Many alloys contain zinc, including brass, an alloy of copper and zinc. Other metals long known to form binary alloys with zinc are aluminium, antimony, bismuth, gold, iron, lead, mercury, silver, tin, magnesium, cobalt, nickel, tellurium and sodium.While neither zinc nor zirconium are ferromagnetic, their alloy ZrZn exhibits ferromagnetism below *5 K.
 
Specifications