Z i n c 鋅. B asic info. ◆ S ymbol: Zn ◇A tomic no.: 30 ◆H as 5 stable isotopes (64, 66, 67, 68, 70 Zn) ◇2 4 th most abundant element in Earth’s crust ◆ Large deposits in Australia, Canada, the US (with largest reserve in Iran)
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◇Atomic no.: 30
◆Has 5 stable isotopes(64, 66, 67, 68, 70 Zn)
◇24th most abundant element in Earth’s crust
◆Large deposits in Australia, Canada, the US(with largest reserve in Iran)
◇The Earth has been estimated to have 46 years supply of Zn
◆Who: Andreas Marggraf
◆When to discover: 1764
◇How: heat a mixture of calamine and carbon in a closed vessel isolate zinc
◆Lustrous solid at room temp.
◇Hard/Brittle at most temp.
◆Malleable between 100-150oC
◆Boiling point: 907oC
◇Melting point: 419.53oC
◆Crystal structure: hexagonal
◇Fair conductor of electricity
◆~70% Zn comes from mining(most from sphalerite, ZnS deposits)
◇~30% Zn comes from recycling of secondary Zn
a) pyrometallurgyb) electrowinning
Electrolysis of molten ore
◆Zn: essential trace element for human
◇Red meat : rich in Zn in general
◆Some plants (eg nuts) contain Zn
◇Highest conc. of Zn in body: in part of the eye / prostate
◆Zn: flexible coordinate geometry proteins use Zn to shift conformations perform biological reactions
◇Zn deficiency growth retardation / diarrhea, etc.
◆Zn overdose suppress Cu / Fe absorption ataxia / lethargy