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High ionic character means that there is a large difference in electronegativity between the two atoms. The ionic character of a covalent bond means that electrons are not attracted equally between the two atoms. High covalent character in an ionic bond means that electrons are partially shared and the difference in electronegativity is smaller.
Ionic and covalent character also influence the physical characteristics of molecules. For example, compounds with higher ionic character generally exhibit higher melting points and are more conductive while compounds with more covalent character are the reverse.
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