This is a list of radioactive

nuclide A nuclide (or nucleide, from nucleus, also known as nuclear species) is a class of atoms characterized by their number of protons, ''Z'', their number of neutrons, ''N'', and their nuclear energy state. The word ''nuclide'' was coined by Truman ...

s (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.

10⁻²⁴ seconds (yoctoseconds)

23 yoctoseconds is the time needed to traverse a 7

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distance at the speed of light, around the diameter of a large atomic nucleus.

10⁻²¹ seconds (zeptoseconds)

10⁻¹⁸ seconds (attoseconds)

10⁻¹⁵ seconds (femtoseconds)

10⁻¹² seconds (picoseconds)

10⁻⁹ seconds (nanoseconds)

10⁻⁶ seconds (microseconds)

10⁻³ seconds (milliseconds)

10⁰ seconds

10³ seconds (kiloseconds)

10⁶ seconds (megaseconds)

10⁹ seconds (gigaseconds)

10¹² seconds (teraseconds)

10¹⁵ seconds (petaseconds)

10¹⁸ seconds (exaseconds)

10²¹ seconds (zettaseconds)

10²⁴ seconds (yottaseconds)

10²⁷ seconds (ronnaseconds)

10³⁰ seconds (quettaseconds)

The half-life of tellurium-128 is over 160

trillion ''Trillion'' is a number with two distinct definitions: * 1,000,000,000,000, i.e. one million million, or (ten to the twelfth power), as defined on the short scale. This is now the meaning in both American and British English. * 1,000,000,000,0 ...

times greater than the age of the universe (which is seconds).

Notes

{{Reflist

External links

Radioactive isotope table
"lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above.
The NUBASE2020 evaluation of nuclear physics properties
F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides. *List Radioactive Radioactivity Tables of nuclides

10−24 seconds (yoctoseconds)

10−21 seconds (zeptoseconds)

10−18 seconds (attoseconds)

10−15 seconds (femtoseconds)

10−12 seconds (picoseconds)

10−9 seconds (nanoseconds)

10−6 seconds (microseconds)

10−3 seconds (milliseconds)

100 seconds

103 seconds (kiloseconds)

106 seconds (megaseconds)

109 seconds (gigaseconds)

1012 seconds (teraseconds)

1015 seconds (petaseconds)

1018 seconds (exaseconds)

1021 seconds (zettaseconds)

1024 seconds (yottaseconds)

1027 seconds (ronnaseconds)

1030 seconds (quettaseconds)

See also