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Whole Number Rule
The Whole Number Rule states that the masses of the elements are whole number multiples of the mass of the hydrogen atom. The rule can be formulated from Prout's hypothesis put forth in 1815. In 1920, Francis W. Aston demonstrated through the use of a mass spectrometer that apparent deviations from the rule were due to the existence of isotopes.
Additional recommended knowledge
Harkins WD (1925). "The Separation of Chlorine into Isotopes (Isotopic Elements) and the Whole Number Rule for Atomic Weights". Proc. Natl. Acad. Sci. U.S.A. 11 (10): 624–8. PMID 16587053.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Whole_Number_Rule". A list of authors is available in Wikipedia.|