IUPAC - monoisotopic element (08735)

monoisotopic element

https://doi.org/10.1351/goldbook.08735

Chemical element having only one stable nuclide.

Notes:

There are 26 elements that follow the definition: $_{}^{}_{}^{9} Be$ , $_{}^{}_{}^{19} F$ , $_{}^{}_{}^{23} Na$ , $_{}^{}_{}^{27} Al$ , $_{}^{}_{}^{31} P$ , $_{}^{}_{}^{45} Sc$ , $_{}^{}_{}^{51} V$ , $_{}^{}_{}^{55} Mn$ , $_{}^{}_{}^{59} Co$ , $_{}^{}_{}^{75} As$ , $_{}^{}_{}^{85} Rb$ , $_{}^{}_{}^{89} Y$ , $_{}^{}_{}^{93} Nb$ , $_{}^{}_{}^{103} Rh$ , $_{}^{}_{}^{113} In$ , $_{}^{}_{}^{127} I$ , $_{}^{}_{}^{133} Cs$ , $_{}^{}_{}^{139} La$ , $_{}^{}_{}^{141} \Pr$ , $_{}^{}_{}^{153} Eu$ , $_{}^{}_{}^{159} Tb$ , $_{}^{}_{}^{165} Ho$ , $_{}^{}_{}^{169} Tm$ , $_{}^{}_{}^{175} Lu$ , $_{}^{}_{}^{185} Re$ , $_{}^{}_{}^{197} Au$ .
General usage of the term 'monoisotopic' refers to the 21 elements with one isotope determining their relative atomic masses, i.e. $_{}^{}_{}^{9} Be$ , $_{}^{}_{}^{19} F$ , $_{}^{}_{}^{23} Na$ , $_{}^{}_{}^{27} Al$ , $_{}^{}_{}^{31} P$ , $_{}^{}_{}^{45} Sc$ , $_{}^{}_{}^{55} Mn$ , $_{}^{}_{}^{59} Co$ , $_{}^{}_{}^{75} As$ , $_{}^{}_{}^{89} Y$ , $_{}^{}_{}^{93} Nb$ , $_{}^{}_{}^{103} Rh$ , $_{}^{}_{}^{127} I$ , $_{}^{}_{}^{133} Cs$ , $_{}^{}_{}^{141} \Pr$ , $_{}^{}_{}^{159} Tb$ , $_{}^{}_{}^{165} Ho$ , $_{}^{}_{}^{169} Tm$ , $_{}^{}_{}^{197} Au$ , $_{}^{}_{}^{209} Bi$ , $_{}^{}_{}^{231} Pa$ .

Source:
PAC, 2021, 93, 69. (Vocabulary of radioanalytical methods (IUPAC Recommendations 2020)) on page 87 [Terms] [Paper]

Citation: 'monoisotopic element' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08735 RIS BibTex EndNote

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monoisotopic element