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interchalcogen
The chalcogens react with each other to form interchalcogen compounds.
Although no chalcogen is extremely electropositive,〔This article uses Pauling electronegativity throughout.〕 nor quite as electronegative as the halogen fluorine (the most electronegative element), there is a large difference in electronegativity between the top (oxygen = 3.44) and bottom (polonium = 2.0) of the group. Combined with the fact that there is a significant trend towards increasing metallic behaviour while descending the group (oxygen is a gaseous nonmetal, while polonium is a silvery post-transition metal〔The classification of polonium as a post-transition metal or a metalloid is disputed.〕), this causes the interchalcogens to display many different kinds of bonding: covalent, ionic, metallic, and semimetallic.〔The heavier halogens are sufficiently electronegative to prevent ionic or metallic bonding in the interhalogens, and the lighter pnictogens are not sufficiently electronegative to allow ionic or metallic bonding in the interpnictogens.〕
==Known interchalcogens==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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