Hive Wiki: Fermium

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Fermium () is a synthetic element with the symbol Fm and atomic number 100. A highly radioactive metallic transuranic element of the actinide series, fermium is made by bombarding plutonium with neutrons and is named after nuclear physicist Enrico Fermi. Fermium is the eighth transuranic element.

Notable characteristics

Only small amounts of fermium have ever been produced or isolated. Thus relatively little is known about its chemical properties. Only the (III) oxidation state of the element appears to exist in aqueous solution. ²⁵⁴Fm and heavier isotopes can be synthesized by intense neutron bombardment of lighter elements (especially uranium and plutonium). During this, successive neutron captures mixed with beta decays build the fermium isotope. The intense neutron bombardment conditions needed to create fermium exist in thermonuclear explosions and can be replicated in the laboratory (such as in the High Flux Isotope Reactor at Oak Ridge National Laboratory). The synthesis of element 102 (nobelium) was confirmed when ²⁵⁰Fm was chemically identified.

Uses

There are no known uses of fermium outside of basic research.

History

Fermium (after Enrico Fermi) was first discovered by a team led by Albert Ghiorso in 1952. The team found ²⁵⁵Fm in the debris of the first hydrogen bomb explosion (see Operation Ivy). That isotope was created when ²³⁸U combined with 17 neutrons in the intense temperature and pressure of the explosion (eight beta decays also occurred to create the element). The work was overseen by the University of California Radiation Laboratory, Argonne National Laboratory, and Los Alamos Scientific Laboratory. All these findings were kept secret until 1955 due to Cold War tensions. ( (#1) ) Samples of sea coral impacted from the first thermonuclear explosion of November 1952 were used. ( (#2) )

In late 1953 and early 1954 a team from the Nobel Institute of Physics in Stockholm bombarded a ²³⁸U target with ¹⁶O ions, producing an alpha-emitter with an atomic weight of ~250 and with 100 protons (in other words, element ²⁵⁰100). ( (#3) ) The Nobel team did not claim discovery until 1954. The isotope they produced was later positively identified as ²⁵⁰Fm.

Isotopes

17 radioisotopes of fermium have been characterized, with the most stable being ²⁵⁷Fm with a half-life of 100.5 days, ²⁵³Fm with a half-life of 3 days, ²⁵²Fm with a half-life of 25.39 hours, and ²⁵⁵Fm with a half-life of 20.07 hours. All of the remaining radioactive isotopes have half-lives that are less than 5.4 hours, and the majority of these have half-lives that are less than 3 minutes. This element also has 1 meta state, ^250mFm (t_½ 1.8 seconds). The isotopes of fermium range in atomic weight from 242.073 u (²⁴²Fm) to 259.101 u (²⁵⁹Fm).

References

Los Alamos National Laboratory - Fermium
Guide to the Elements - Revised Edition, Albert Stwertka, (Oxford University Press; 1998) ISBN 0-19-508083-1
It's Elemental - Fermium

External links

WebElements.com - Fermium

Category:Chemical elements Category:Actinides Category:Synthetic elements

ar:فرميوم az:Fermium bn:ফার্মিয়াম be:Фермій bs:Fermijum ca:Fermi (element) cs:Fermium co:Fermiu da:Fermium de:Fermium et:Fermium el:Φέρμιο es:Fermio eo:Fermio eu:Fermio fr:Fermium fur:Fermi gv:Fermium gl:Fermio ko:페르뮴 hy:Ֆերմիում hr:Fermij it:Fermio he:פרמיום jv:Fermium ht:Fèmyòm la:Fermium lv:Fermijs lb:Fermium lt:Fermis jbo:jinmrfermi hu:Fermium ml:ഫെര്‍മിയം mr:फर्मियम nl:Fermium ja:フェルミウム no:Fermium nn:Fermium pl:Ferm (pierwiastek) pt:Férmio ru:Фермий simple:Fermium sk:Fermium sl:Fermij sr:Фермијум sh:Fermijum fi:Fermium sv:Fermium th:เฟอร์เมียม tr:Fermiyum uk:Фермій zh:镄

From Perodic Table

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Hive Wiki: Fermium

Allowing everyday users to create and edit any page in a Hive Wiki Web site is exciting in that it encourages democratic use of the Web and promotes content composition by nontechnical users. Get Fresh Gratis HiveWiki Now! Home \| Edit \| Index \| Recent Changes Fermium () is a synthetic element with the symbol Fm and atomic number 100. A highly radioactive metallic transuranic element of the actinide series, fermium is made by bombarding plutonium with neutrons and is named after nuclear physicist Enrico Fermi. Fermium is the eighth transuranic element. Notable characteristics Only small amounts of fermium have ever been produced or isolated. Thus relatively little is known about its chemical properties. Only the (III) oxidation state of the element appears to exist in aqueous solution. ²⁵⁴Fm and heavier isotopes can be synthesized by intense neutron bombardment of lighter elements (especially uranium and plutonium). During this, successive neutron captures mixed with beta decays build the fermium isotope. The intense neutron bombardment conditions needed to create fermium exist in thermonuclear explosions and can be replicated in the laboratory (such as in the High Flux Isotope Reactor at Oak Ridge National Laboratory). The synthesis of element 102 (nobelium) was confirmed when ²⁵⁰Fm was chemically identified. Uses There are no known uses of fermium outside of basic research. History Fermium (after Enrico Fermi) was first discovered by a team led by Albert Ghiorso in 1952. The team found ²⁵⁵Fm in the debris of the first hydrogen bomb explosion (see Operation Ivy). That isotope was created when ²³⁸U combined with 17 neutrons in the intense temperature and pressure of the explosion (eight beta decays also occurred to create the element). The work was overseen by the University of California Radiation Laboratory, Argonne National Laboratory, and Los Alamos Scientific Laboratory. All these findings were kept secret until 1955 due to Cold War tensions. ( (#1) ) Samples of sea coral impacted from the first thermonuclear explosion of November 1952 were used. ( (#2) ) In late 1953 and early 1954 a team from the Nobel Institute of Physics in Stockholm bombarded a ²³⁸U target with ¹⁶O ions, producing an alpha-emitter with an atomic weight of ~250 and with 100 protons (in other words, element ²⁵⁰100). ( (#3) ) The Nobel team did not claim discovery until 1954. The isotope they produced was later positively identified as ²⁵⁰Fm. Isotopes 17 radioisotopes of fermium have been characterized, with the most stable being ²⁵⁷Fm with a half-life of 100.5 days, ²⁵³Fm with a half-life of 3 days, ²⁵²Fm with a half-life of 25.39 hours, and ²⁵⁵Fm with a half-life of 20.07 hours. All of the remaining radioactive isotopes have half-lives that are less than 5.4 hours, and the majority of these have half-lives that are less than 3 minutes. This element also has 1 meta state, ^250mFm (t_½ 1.8 seconds). The isotopes of fermium range in atomic weight from 242.073 u (²⁴²Fm) to 259.101 u (²⁵⁹Fm). References Los Alamos National Laboratory - Fermium Guide to the Elements - Revised Edition, Albert Stwertka, (Oxford University Press; 1998) ISBN 0-19-508083-1 It's Elemental - Fermium External links WebElements.com - Fermium Category:Chemical elements Category:Actinides Category:Synthetic elements ar:فرميوم az:Fermium bn:ফার্মিয়াম be:Фермій bs:Fermijum ca:Fermi (element) cs:Fermium co:Fermiu da:Fermium de:Fermium et:Fermium el:Φέρμιο es:Fermio eo:Fermio eu:Fermio fr:Fermium fur:Fermi gv:Fermium gl:Fermio ko:페르뮴 hy:Ֆերմիում hr:Fermij it:Fermio he:פרמיום jv:Fermium ht:Fèmyòm la:Fermium lv:Fermijs lb:Fermium lt:Fermis jbo:jinmrfermi hu:Fermium ml:ഫെര്‍മിയം mr:फर्मियम nl:Fermium ja:フェルミウム no:Fermium nn:Fermium pl:Ferm (pierwiastek) pt:Férmio ru:Фермий simple:Fermium sk:Fermium sl:Fermij sr:Фермијум sh:Fermijum fi:Fermium sv:Fermium th:เฟอร์เมียม tr:Fermiyum uk:Фермій zh:镄 From Perodic Table Fresh copy to be cached until 1:54:04 AM 139 hits This Page: Edit \| History This Wiki: Home \| Related To Fermium \| Index \| Recent Changes \| Random Page \| Search Login \| Create New Wiki \| Wiki List 9/10/2010 5:54 PM v0.61.106 ADBEFEED
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