covalencen.
/kəʊˈveɪləns/ Chemistry.
= covalency n. a, b.
ΘΚΠ
the world > matter > chemistry > chemical bonding > [noun] > covalent bonding > number of electrons forming
covalence1919
covalency1919
the world > matter > chemistry > chemical bonding > [noun] > covalent bonding > covalency
covalency1946
covalence1957
1919 I. Langmuir in Proc. National Acad. Sci. U.S.A. 5 255 It is therefore proposed to define valence as the number of pairs of electrons which a given atom shares with others. In view of the fact..that valence is very often used to express something quite different, it is recommended that the word covalence be used to denote valence defined as above.
1919 I. Langmuir in Proc. National Acad. Sci. U.S.A. 5 256 In sodium chloride the covalence of both sodium and chlorine is zero.
1948 S. Glasstone Textbk. Physical Chem. (ed. 2) i. 104 The covalence of any element, not including dative covalences, should consequently be equal to the number of electrons with unpaired spins in the given atom.
1957 Encycl. Brit. XXII. 946/1 Another kind of valence of great importance is ‘covalence’, which results from the sharing of two electrons by two atoms.
Derivatives
coˈvalently adv.
ΘΚΠ
the world > matter > chemistry > chemical bonding > [adverb] > in a covalent manner
covalently1962
1962 S. G. Waley in A. Pirie Lens Metabolism 357 Both biotin and lipoic acid..are covalently bound to protein.
This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018).
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