单词	covalent
释义	covalent /kəʊˈveɪl(ə)nt / adjective Chemistry Relating to or denoting chemical bonds formed by the sharing of electrons between atoms. Often contrasted with ionic.Pairs of electrons that are not shared in covalent bonds are lone pairs.... The three shared pairs of electrons between the two carbon atoms create a triple covalent bond. In a covalent diatomic molecule, a difference in the electronegativity of the atoms will result in a dipole moment. Derivatives covalence noun ... We describe a rough estimate that suggests such effects on the degree of covalence are very small. Indeed the measurements of bond length make this the best single formula that can be written with two single and two double S-O bonds, making six covalences in all. It is argued that the terms valence, covalence, hypervalence, oxidation state, and coordination number are often confused and misused in the literature. covalency noun ... Ni 2+ has a highly polarizable electron shell that results in greater covalency in its bonds. I plan to use this to emphasize polar and non-polar covalencies as a real-life application. The first rule states that covalencies are more likely to be formed as the number of electrons to be removed or donated increases, so that highly charged ions are rare or impossible. covalently adverb ... Many nitrates are ionic in nature, but heavy metal nitrates and anhydrous nitrates have covalently bonded nitrate groups. Hybridization explains the molecular geometry of the resulting covalently bonded molecules. Linear polymers are long, chainlike molecules covalently bonded in a rigid manner.
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