Abegg's rule states the sum of the absolute values of the maximum positive and negative valence of an atom is often equal to eight.
- Abegg’s rule is sometimes referred to as "Abegg’s law of valence and countervalence".
- for a given chemical element (as sulfur) Abegg’s rule states that the sum of the absolute value of its negative valence (such as −2 for sulfur in H2S) and its positive valence of maximum value (as +6 for sulfur in H2SO4) is often equal to 8.
- The rule used a historic meaning of valence which resembles the modern concept of oxidation state in which an atom is an electron donor or receiver.
Abegg, Richard Wilhelm Heinrich
- January 9, 1869 – April 3, 1910
- Danish chemist, major work on chemical valence
- Trained as organic chemist (student of August Wilhelm von Hofmann at the University of Berlin); but practiced physical chemistry with Friedrich Wilhelm Ostwald in Leipzig, Germany
- Abegg, R. (1904). "Die Valenz und das periodische System. Versuch einer Theorie der Molekularverbindungen (The valency and the periodical system - Attempt on a theory of molecular compound)". Zeitschrift für anorganische Chemie 39 (1): 330–380. doi:10.1002/zaac.19040390125.
- Lewis, Gilbert N. (1916-04-01). "THE ATOM AND THE MOLECULE". Journal of the American Chemical Society 38 (4): 762–785. doi:10.1021/ja02261a002.
- Pauling, Linus (1960-06). The Nature of the Chemical Bond and the Structure of Molecules and Crystals; An Introduction to Modern Structural Chemistry. (3 ed.). Cornell University Press. ISBN 0-8014-0333-2.
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