Difference between revisions of "Mass number"

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Revision as of 17:28, 5 December 2005

Mass number
The sum of the protons and neutrons in an atom, molecule or ion.
Considered between 2004 and 2006 but not included in the 2006 PAC submission
This is an unofficial draft definition presented for information and comment.

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Mass Number

Total number of heavy particles (protons and neutrons jointly called nucleons) in the atomic nucleus. Also called nucleon number. Symbol m in mass spectrometry.

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