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The rule has also been extended to predict bond lengths in Grimm–Sommerfeld compounds. When the sum of the atomic numbers is the same the bond lengths are the same. An example is the series of bond lengths ranging from 244.7 pm to 246 pm. for the Ge–Ge bond in elemental
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predicts that binary compounds with covalent character that have an average of 4 electrons per atom will have structures where both atoms are tetrahedrally coordinated (e.g. have the
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Gorynova expanded the scope of the rules to include ternary compounds where the average number of valence electrons per atom was four. Examples of this are the I-IV
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Ulrich Müller, "Inorganic
Structural Chemistry" 2d edition, John Wiley & Sons, Chichester, New York, Brisbane, Toronto, Singapore, 2007
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Grimm, H.G.; Sommerfeld, A (1926). "Über den. Zusammenhang des
Abschlusses der Elektronengruppen im Atom mit den chemischen Valenzzahlen".
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Compounds or phases that obey the Grimm–Sommerfeld rule are termed Grimm–Sommerfeld compounds or phases.
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Properties of
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Concise
Encyclopedia Chemistry, Mary Eagleson, Walter de Gruyter, 1994
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