Whole number rule

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.cite journal |author=Budzikiewicz H, Grigsby RD |title=Mass spectrometry and isotopes: a century of research and discussion |journal=Mass spectrometry reviews |volume=25 |issue=1 |pages=146–57 |year=2006 |pmid=16134128 |doi=10.1002/mas.20061] The rule can be formulated from Prout's hypothesis put forth in 1815. [ cite journal|title=On the relation between the specific gravities of bodies in their gaseous state and the weights of their atoms.|journal=Annals of Philosophy|date=1815|first=William|last=Prout|coauthors=|volume=6|issue=|pages=321–330|id= |url=http://web.lemoyne.edu/~giunta/PROUT.HTML|format=|accessdate=2007-09-08 ] 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. [ cite journal|title=The constitution of atmospheric neon|journal=Philosophical Magazine|date=1920|first=Francis W.|last=Aston|coauthors=|volume=39|issue=6|pages=449–455|id= |url=|format=|accessdate=2007-09-08 ]

ee also

*William Prout
*Atomic mass
*Binding energy

References

External links

* [http://nobelprize.org/nobel_prizes/chemistry/laureates/1922/press.html 1922 Nobel Prize Presentation Speech]


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