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Z i n c 鋅

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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Z i n c 鋅

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  1. Zinc 鋅

  2. Basic info. ◆Symbol: Zn ◇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

  3. Discovery ◆Who: Andreas Marggraf ◇Nationality: German ◆When to discover: 1764 ◇How: heat a mixture of calamine and carbon in a closed vessel  isolate zinc

  4. Physical property ◆Lustrous solid at room temp. ◇Hard/Brittle at most temp. ◆Malleable between 100-150oC ◇Density: 7.14g/cm3 ◆Boiling point: 907oC ◇Melting point: 419.53oC ◆Crystal structure: hexagonal ◇Fair conductor of electricity

  5. Production ◆~70% Zn comes from mining(most from sphalerite, ZnS deposits) ◇~30% Zn comes from recycling of secondary Zn ◆Production process: Ore grinding Froth flotation Roasting a) pyrometallurgyb) electrowinning Electrolysis of molten ore

  6. Application: anti-corrosion

  7. Application: alloy

  8. Application: use of other compounds

  9. Biological importance ◆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

  10. Biological importance ◆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 The end

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