group 16: the chalcogens
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11 Terms
oxygen present as O2 in
oxides, silicate and carbonate minerals
most stable form of sulphur
rhombic sulphur which consists of stacked rings of S8
uses of sulphur
to strengthen rubber - vulcanisation
the contact process
produce H2SO4
sulphuric acid
oily liquid, melting point, Bronsted acid, good oxidising agent
use of sulphuric acid
the manufacture of ammonium sulphate - fertiliser, petrochemicals, dyestuffs and detergents
sulphur compounds containing oxygen
hydrogen sulphide
thiosulphate ions
selenium deficiency
connected to occurrence of congestive heart failure, toxic in excess
uses of selenium
a photoreceptor
polonium
has 27 isotopes; highly toxic and very radioactive
210Po
found in tobacco, an alpha particle emitter
Note 
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