Interchalcogen chalcogens react with each other to form interchalcogen compounds.chalcogen is extremely electropositive , nor quite as electronegative as the halogen fluorine , there is a large difference in electronegativity between the top and bottom of the group. Combined with the fact that there is a significant trend towards increasing metallic behaviour while descending the group, this causes the interchalcogens to display many different kinds of bonding: covalent , ionic , metallic, and semimetallic.Known binary interchalcogens Bonding in the binary interchalcogens Going down the above table , there is a transition from covalent bonding to ionic bonding ; going across the table, there is a transition from ionic bonding to metallic bonding . For example, in the leftmost column of the table, O2 and O3 are purely covalent, SO2 and SO3 are polar molecules , SeO2 forms chained polymers, TeO2 forms layered polymers, and PoO2 is ionic with the fluorite structure ; in the bottom row of the table, PoO2 and PoS are ionic, Po x y x Te y ∞ is metallic.Summary of known binary interchalcogens Sulfur chalcogenides Lower sulfur oxides , Sx Oy where the ratio X:Y is greater than 1:2 *Disulfur monoxide, S2 O *Disulfur dioxide, S2 O2 *Sulfur monoxide, SO Sulfur dioxide, SO2 Sulfur trioxide , SO3 Higher sulfur oxides, SOx where x>3Selenium chalcogenides Selenium dioxide, SeO2 Selenium trioxide, SeO3 Many "alloys" of selenium and sulfur in different concentrations with semimetallic bonding, Sex y *"Selenium monosulfide", SeS *"Selenium disulfide", SeS2 , actually a 2:1 mixture of cyclo-Se3 S5 and cyclo-Se2 S6 *"Selenium trisulfide", SeS3 , actually occurring as the cyclic dimer Se2 S6 Tellurium chalcogenides Tellurium monoxide, TeO Tellurium dioxide, TeO2 Tellurium trioxide, TeO3 Ditellurium pentoxide , Te2 O5 Many "alloys" of tellurium and sulfur in different concentrations with semimetallic bonding, Tex y Many "alloys" of tellurium and selenium in different concentrations with semimetallic bonding, Tex y Polonium chalcogenides Polonium monoxide, PoO Polonium dioxide, PoO2 Polonium trioxide, PoO3 Polonium monosulfide, PoS Many "alloys" of polonium and selenium in different concentrations with semimetallic bonding, Pox y Many "alloys" of polonium and tellurium in different concentrations with semimetallic bonding, Pox y
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