Not to be confused with the 26 monoisotopic elements defined as having only one stable nuclide.
Mononuclidic and monoisotopic (19 elements) Two mononuclidic, but radioactive elements (bismuth and protactinium)
A mononuclidic element or monotopic element[1] is one of the 21 chemical elements that is found naturally on Earth essentially as a single nuclide (which may, or may not, be a stable nuclide). This single nuclide will have a characteristic atomic mass. Thus, the element's natural isotopic abundance is dominated by one isotope that is either stable or very long-lived. There are 19 elements in the first category (which are both monoisotopic and mononuclidic), and 2 (bismuth[a] and protactinium) in the second category (mononuclidic but not monoisotopic, since they have zero, not one, stable nuclides). A list of the 21 mononuclidic elements is given at the end of this article.
Of the 26 monoisotopic elements that, by definition, have only one stable isotope, seven are not considered mononuclidic, due to the presence of a significant fraction of a very long-lived (primordial) radioisotope. These elements are vanadium, rubidium, indium, lanthanum, europium, lutetium, and rhenium.
^Housecroft, C. E.; Sharpe, A. G. (2012). Inorganic Chemistry (4th ed.). Prentice Hall. p. 2. ISBN 978-0273742753.
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and 25 Related for: Mononuclidic element information
A mononuclidicelement or monotopic element is one of the 21 chemical elements that is found naturally on Earth essentially as a single nuclide (which...
Radionuclide Mononuclidicelement Stable isotope List of elements by stability of isotopes N. E. Holden, "Standard Atomic Weight Values for the Mononuclidic Elements...
half-life Table of nuclides Isotope geochemistry Radionuclide Mononuclidicelement Monoisotopic element Stable isotope List of nuclides List of elements by stability...
all stable elements with an even atomic number, a monoisotopic and mononuclidicelement. Radioactive cosmogenic 10Be is produced in the atmosphere of the...
(IUPAC) reclassified thorium as a binuclidic element in 2013; it had formerly been considered a mononuclidicelement. Thorium has three known nuclear isomers...
current form since the formation of the planet. It is therefore a mononuclidicelement and its standard atomic weight is virtually the same as that of the...
than trace quantities; therefore, fluorine is a monoisotopic and mononuclidicelement. The longest-lived radioisotope is 18 F ; it has a half-life of 109...
which have only one significant naturally-abundant nuclide (compare: mononuclidicelement for the proton numbers) are: 0, 2, 3, 4, 9, 11, 13, 15, 17, 21, 23...
nuclides in order of stability, all with half-lives over one hour) Mononuclidicelement Periodic table Primordial nuclide Radionuclide Stable isotope ratio...
Co, consists of a single stable isotope, 59Co (thus, cobalt is a mononuclidicelement). Twenty-eight radioisotopes have been characterized; the most stable...
nuclide. As such, beryllium is considered a monoisotopic element. It is also a mononuclidicelement, because its other isotopes have such short half-lives...
small to affect atomic weight measurements; iodine is thus also a mononuclidicelement—one that is found in nature only as a single nuclide. Most 129I derived...
stable and naturally occurring isotope, 141Pr. It is thus a mononuclidic and monoisotopic element, and its standard atomic weight can be determined with high...
isotopes List of radioactive nuclides by half-life Monoisotopic elementMononuclidicelement Primordial nuclide Radionuclide Stable nuclide Table of nuclides...
the case of many elements that have one naturally occurring isotope (mononuclidic elements) or one dominant isotope, the difference between the atomic...
too short to be primordial. As such, iodine is both monoisotopic and mononuclidic and its atomic weight is known to great precision, as it is a constant...
so-called mononuclidic elements, having a single primordial stable isotope that dominates and fixes the atomic weight of the natural element to high precision;...
its only naturally occurring isotope, so gold is both a mononuclidic and monoisotopic element. Thirty-six radioisotopes have been synthesized, ranging...
between samples. For this reason, the relative atomic masses of the 22 mononuclidic elements (which are the same as the isotopic masses for each of the single...
terbium is composed of its only stable isotope, terbium-159; the element is thus mononuclidic and monoisotopic. Thirty-six radioisotopes have been characterized...
can be safely handled and have the two highest atomic masses among the mononuclidic elements that are stable (gold) or effectively so (bismuth). See also...
chemical element (symbol Ar°(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element weighted...
makes up nearly all natural thorium, so thorium was considered to be mononuclidic. However, in 2013, IUPAC reclassified thorium as binuclidic, due to large...
reactors: In contrast to uranium, naturally occurring thorium is effectively mononuclidic and contains no fissile isotopes; fissile material, generally 233 U ...
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