Zinc - Kwun Tong Government Secondary School

Kwun Tong Government Secondary School
Chamistry - Periodic Table of elements ( Zinc )
Name: Chan Maxwell Chun Sum
Zinc bucket
Class: 3A (30)
Zinc oxide
Zinc chloride
Basic Properties
Group IIB ; Period 4
Electrons arrangement: 2, 8, 18, 2
Crystal structure: Hexagonal
Status at room temperature: Solid (Hard & Btittle)
Melting & Boiling points: 419.6°C, 906°C
Has 33 isotopes but only 5 are stable (64, 66, 67, 68, 70 Zn)
Zinc sulfide
Canthbe burn in the air and become
Zinc Oxide (2Zn+O2 -> 2ZnO)
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The 4 common metal and the 24 most aboundant element in earth
Useage
Ancient use: Used for brass in weaponry
Industrial use: Anti-corrosion (coating of iron and steel because Zn is more
reactive than iron or steel) ; Anode material for batteries (in alkaline and zinc–
carbon batteries) ; Alloys with copper (e.g. nickel silver, typewriter metal, deep
drawing and commercial bronze) ; Zinc chloride (in fire retardant) ; Zinc sulfide
(luminescent pigments of X-ray and television screens) ; Salting material (in
nuclear weapons)
Biological use: 2-4 gram of Zinc in our body (brain, muscle, bones and eye)
; Enzyme (an essential trace element necessary for plants, animals and
microorganisms, also make as useful catalytic agent in hydroxylation) ; Proteins
(Zn ions coordinated to the amino acid side chains of aspartic acid, glutamic
acid, cysteine and histidine)
Medical use: Dietary intake (Can protect against sunburn and diaper rash,
prevent halitosis, kill prostate cancer cells, heal over the cut, etc.)
Discovery of Zinc
By a German chemist Andreas Sigismund Marggraf in 1746
By heating a mixture of calamine and C in a vessel without Cu
Precautions
Zinc toxicity: Excessive Zn suppress Cu and Fe absorption
Brass alloy
Free zinc ion: Corrosive and highly toxic to plants,
invertebrates and vertebrate fish
1
30
Zn
Zinc
Zinc tablets
Zinc-carbon battery
65.39
Alkaline-battery
Zinc
Andreas Sigismund Marggraf