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Versie door Bex op 29 nov 2007 om 12:20
One of two or more atoms of the same element that have the same number of protons in their nucleus but a different number of neutrons. Most elements in nature consist of a mixture of isotopes..
- Martin E. and Hine R.S. (2000). Oxford Dictionary of Biology (4th Ed). Oxford University Press: New York, (USA). 641pp.