Abegg's rule of eight
- A rule that the sum of the maximum positive and negative valencies of an element is eight, e.g., sulphur in SF6 and H2S.
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Abegg's rule — ä .begz , .beks n a rule in chemistry: for a given chemical element (as sulfur) the sum of the absolute value of its negative valence of maximum absolute value (as 2 for sulfur in H2S) and its positive valence of maximum value (as +6 for sulfur… … Medical dictionary
Abegg's rule — In chemistry, Abegg’s rule states that the difference between the maximum positive and negative valence of an element is frequently eight. In general, for a given chemical element (as sulfur) Abegg’s rule states that the sum of the absolute value … Wikipedia
Abegg , Richard — (1869–1910) German physical chemist Abegg was born in the German port of Danzig (now Gdańsk in Poland); he studied chemistry at Kiel, Tübingen, and Berlin. He graduated in 1891 as a pupil of Wilhelm Hofmann. Initially an organic chemist, he was… … Scientists
rule — A criterion, standard, or guide governing a procedure, arrangement, action, etc. SEE ALSO: law, principle, theorem. [O. Fr. reule, fr. L. regula, a guide, pattern] Abegg r. the tendency of the sum of the … Medical dictionary
Octet rule — The bonding in carbon dioxide (CO2): all atoms are surrounded by 8 electrons, fulfilling the octet rule. The octet rule is a chemical rule of thumb that states that atoms of low (<20) atomic number tend to combine in such a way that they each… … Wikipedia
Richard Abegg — Infobox Scientist name = Richard Abegg caption = Richard Wilhelm Heinrich Abegg (1869 1910) birth date = birth date|1869|1|9|mf=y birth place = Danzig, Germany residence = Germany nationality = German death date = death date and… … Wikipedia
History of the molecule — In chemistry, the history of the molecule traces the origins of the concept or idea of the existence of strong chemical bonds between two or more atoms. The modern concept of molecules can be traced back towards pre scientific Greek philosophers… … Wikipedia
Alfred Werner — Infobox Scientist name = Alfred Werner image size=180px birth date = December 12, 1866 birth place = Mulhouse, Alsace nationality = Switzerland death date = death date and age| 1919|11|15|1866|12|12 death place = field = Inorganic chemistry work… … Wikipedia
Cubical atom — The cubical atom was an early atomic model in which electrons were positioned at the eight corners of a cube in a non polar atom or molecule. This theory was developed in 1902 by Gilbert N. Lewis and published in 1916 in the famous article The… … Wikipedia
Valence (chemistry) — For other uses, see Valence (disambiguation). In chemistry, valence, also known as valency or valence number, is a measure of the number of bonds formed by an atom of a given element. Valence can be defined as the number of valence bonds a… … Wikipedia