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Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable. All elements with atomic number of 106 ( seaborgium ) or greater have most-stable-known isotopes shorter than that of francium, but as those elements have only a relatively small number of isotopes discovered, the possibility remains that ...
This page uses the meta infobox {{Infobox isotopes (meta)}} for the element isotopes infobox.. This infobox contains the table of § Main isotopes, and the § Standard atomic weight.
Francium-223 and francium-221 are the only isotopes that occur in nature, with the former being far more common. [ 21 ] Francium-223 is the most stable isotope, with a half-life of 21.8 minutes, [ 8 ] and it is highly unlikely that an isotope of francium with a longer half-life will ever be discovered or synthesized. [ 22 ]
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
A table or chart of nuclides is a two-dimensional graph of isotopes of the elements, in which one axis represents the number of neutrons (symbol N) and the other represents the number of protons (atomic number, symbol Z) in the atomic nucleus. Each point plotted on the graph thus represents a nuclide of a known or hypothetical chemical element.
The isotope tables given below show all of the known isotopes of the chemical elements, arranged with increasing atomic number from left to right and increasing neutron number from top to bottom. Half lives are indicated by the color of each isotope's cell (see color chart in each section).
Pages in category "Isotopes of francium" ... Francium-233 This page was last edited on 29 March 2013, at 21:35 (UTC). Text is available under the Creative ...
Therefore, the isotopes of most interest are 310 126, 322 126, and 354 126, for these might be considerably longer-lived than other isotopes. Element 126, having a magic number of protons , is predicted to be more stable than other elements in this region, and may have nuclear isomers with very long half-lives . [ 76 ]