Isotopes of promethium

Isotopes of promethium

36 radioisotopes of promethium (Pm) have been characterized, with the most stable being 145Pm with a half-life of 17.7 years, 146Pm with a half-life of 5.53 years, and 147Pm with a half-life of 2.6234 years. All of the remaining radioactive isotopes have half-lives that are less than 364 days, and the majority of these have half lives that are less than 27 seconds. This element also has 11 meta states with the most stable being 148Pm"m" (T½ 41.29 days), 152Pm"m"2 (T½ 13.8 minutes) and 152Pm"m" (T½ 7.52 minutes).

The isotopes of promethium range in atomic weight from 127.9482600 u (128Pm) to 162.9535200 u (163Pm). The primary decay mode before the longest-lived isotope, 145Pm, is electron capture, and the primary mode after is beta minus decay. The primary decay products before 145Pm are neodymium (Nd) isotopes and the primary products after are samarium (Sm) isotopes.

tability of promethium isotopes

Beside technetium, promethium is one of the two elements with atomic number less than 83 that have only unstable isotopes, which is a rarely occurring effect of the liquid drop model and stabilities of neighbor element isotopes.


Has no stable isotopes. A standard atomic mass cannot be given.

Table

Notes

* Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
* Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

* Isotope masses from [http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in "Nuclear Physics" A729 (2003).
* Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)] . "Pure Appl. Chem." Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)] .
* Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties] , Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
** David R. Lide (ed.), Norman E. Holden in "CRC Handbook of Chemistry and Physics, 85th Edition", online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Promethium — (pronEng|prəˈmiːθiəm/, /proʊˈmiːθiəm) is a chemical element with the symbol Pm and atomic number 61. It is notable for being the only other exclusively radioactive element besides technetium which is followed by chemical elements that have stable …   Wikipedia

  • Promethium-147 — is an isotope of promethium with a half life of 2.62 years. It is the promethium isotope easiest producible, because it is a fission product from nuclear reactors (the longest living promethium isotope Pm 145 is more difficult to… …   Wikipedia

  • promethium — /preuh mee thee euhm/, n. Chem. a rare earth, metallic, trivalent element. Symbol: Pm; at. no.: 61. [1945 50; < NL; see PROMETHEUS, IUM] * * * ▪ chemical element  (Pm), chemical element, only rare earth metal of transition Group IIIb of the… …   Universalium

  • Isotopes of neodymium — Naturally occurring neodymium (Nd) is composed of 5 stable isotopes, 142Nd, 143Nd, 145Nd, 146Nd and 148Nd, with 142Nd being the most abundant (27.2% natural abundance), and 2 radioisotopes, 144Nd and 150Nd. In all, 33 radioisotopes of Neodymium… …   Wikipedia

  • Promethium — Prométhium Pour les articles homonymes, voir Pm. Prométhéum …   Wikipédia en Français

  • prométhium — [ prɔmetjɔm ] n. m. • promethium 1953; de Prométhée ♦ Chim. Élément atomique (Pm; no at. 61; m. at. [isotope de plus longue période] 145) du groupe des lanthanides. Tous les isotopes connus du prométhium sont radioactifs. prométhium n. m. CHIM… …   Encyclopédie Universelle

  • Isotopes of technetium — Technetium (Tc) is one of the two elements in the first 82 that have no stable isotopes (in fact, it is the lowest numbered element that is exclusively radioactive); the other such element is promethium. [ LANL Periodic Table , Technetium… …   Wikipedia

  • Prométhium — Pour les articles homonymes, voir Pm. Prométhium Néodyme ← Prométhium → …   Wikipédia en Français

  • Isotopes of samarium — Naturally occurring samarium (Sm) is composed of 4 stable isotopes, 144Sm, 150Sm, 152Sm and 154Sm, and 3 extremely long lived radioisotopes, 147Sm (1.06e|11y), 148Sm (7e|15y) and 149Sm (>2e|15y), with 152Sm being the most abundant (26.75% natural …   Wikipedia

  • List of fictional elements, materials, isotopes and atomic particles — This list contains chemical elements, materials, isotopes or (sub)atomic particle that exist primarily in works of fiction (usually fantasy or science fiction). No actual periodic elements end in ite , though many minerals have names with this… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”