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|Sum of the mass numbers of the constituent atoms of an molecule or ion.
|Related Term(s): mass number, nominal mass|
Murray, K.K. "Comment on: 'Nominal Mass?' by Athula B. Attygalle and Julius Pavlov," J. Am. Soc. Mass Spectrom. 28, 1737-1738 (2017). 12 (2017); http://dx.doi.org/10.1007/s13361-017-1801-1
|This is a revision of or addition to a term or terms in |
Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.
- Mallet and Down ISBN 0470027614
- "The mass of a molecule or ion calculated using the integral masses of the most abundant isotopes of each element present"
- Sparkman ISBN 0966081390
- "The integer mass of the most abundant naturally occurring stable isotope of an element ... the nominal mass of an element is equal to the mass number of the most abundant stable isotope of an element"
- de Hoffmann ISBN 0470033118
- "The nominal mass is calculated using the mass of the predominant isotope of each element rounded to the nearest integer value that corresponds to the mass number ..."
- Watson and Sparkman ISBN 0470516348
- "The nominal mass of an element is the integer mass of its most abundant stable isotope ... the nominal mass of a molecule, radical, or ion is the sum of the nominal masses of all the atoms of its constituent elements." (common organic elements this is the lowest but not always)
- Gross ISBN 3642423469
- "the nominal mass of an element is defined as the integer mass of its most abundant naturally occurring stable isotope ... the nominal mass of an ion is the sum of the nominal masses of its constituent elements."