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单词 valency
释义 valency(valence)
The combining power of an atom or radical, equal to the number of hydrogen atoms that the atom could combine with or displace in a chemical compound (hydrogen has a valency of 1). It is equal to the ionic charge in ionic compounds; for example, in Na2S, sodium has a valency of 1 (Na+) and sulphur a valency of 2(S2-). In covalent compounds it is equal to the number of bonds formed; in CO2 both carbon and oxygen have a valency of 2
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