Hive Wiki: Mendelevium

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Mendelevium (), also known as unnilunium (, symbol Unu) is a synthetic element with the symbol Md (formerly Mv) and the atomic number 101. A metallic radioactive transuranic element of the actinides, mendelevium is synthesized by bombarding einsteinium with alpha particles and was named after Dmitri Mendeleev.

Notable characteristics

Researchers have shown that mendelevium has a moderately stable dipositive (II) oxidation state in addition to the more characteristic (for actinide elements) tripositive (III) oxidation state. ²⁵⁶Md has been used to find out some of the chemical properties of this element while in an aqueous solution. There are no other uses of mendelevium and only trace amounts of the element have ever been produced.

History

Mendelevium (for Dmitri Mendeleev, surname commonly spelt as Mendeleev, Mendeleyev, Mendeléef, or even Mendelejeff, and first name sometimes spelt as Dmitry or Dmitriy) was first synthesized by Albert Ghiorso (team leader), Glenn T. Seaborg, Bernard Harvey, Greg Choppin, and Stanley G. Thompson in early 1955 at the University of California, Berkeley. The team produced ²⁵⁶Md (half-life of 76 minutes) when they bombarded an ²⁵³Es target with alpha particles (helium nuclei) in the Berkeley Radiation Laboratory's 60-inch cyclotron (²⁵⁶Md was the first element to be synthesized one-atom-at-a-time). Element 101 was the ninth transuranic element synthesized.

Isotopes

15 radioisotopes of mendelevium have been characterized, with the most stable being ²⁵⁸Md with a half-life of 51.5 days, ²⁶⁰Md with a half-life of 31.8 days, and ²⁵⁷Md with a half-life of 5.52 hours. All of the remaining radioactive isotopes have half-lives that are less than 97 minutes, and the majority of these have half-lives that are less than 5 minutes. This element also has 1 meta state, ^258mMd (t_½ 57 minutes). The isotopes of mendelevium range in atomic weight from 245.091 u (²⁴⁵Md) to 260.104 u (²⁶⁰Md).

References

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

External links

WebElements.com - Mendelevium

Category:Actinides Category:Chemical elements Category:Synthetic elements

ar:مندليفيوم az:Mendeleyevum bn:মেন্ডেলেভিয়াম be:Мендзялевій bs:Mendeljejevijum ca:Mendelevi cs:Mendelevium co:Mendeleviu da:Mendelevium de:Mendelevium et:Mendeleevium el:Μεντελέβιο es:Mendelevio eo:Mendelevio eu:Mendelebio fa:مندلویوم fr:Mendélévium fur:Mendelevi gv:Mendelevium gl:Mendelevio ko:멘델레븀 hy:Մենդելեվիում hr:Mendelevij it:Mendelevio he:מנדלביום jv:Mendelevium la:Mendelevium lv:Mendeļejevijs lb:Mendelevium lt:Mendelevis jbo:jinmrmendelevi hu:Mendelévium ml:മെന്‍ഡെലീവിയം nl:Mendelevium ja:メンデレビウム no:Mendelevium nn:Mendelevium pl:Mendelew pt:Mendelévio ru:Менделевий scn:Mendeleviu sk:Mendelevium sl:Mendelevij sr:Мендељејевијум sh:Mendeljejevijum fi:Mendelevium sv:Mendelevium th:เมนเดลีเวียม tr:Mendelevyum uk:Менделєвій zh:钔

From Perodic Table

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Hive Wiki: Mendelevium

Creating new pages is simple with Hive Wiki. Hive Wikis let you link to pages that don't yet exist, and the Hive Wiki makes organization easy. Go Here To Make Your Free HiveWiki Now! Home \| Edit \| Index \| Recent Changes Mendelevium (), also known as unnilunium (, symbol Unu) is a synthetic element with the symbol Md (formerly Mv) and the atomic number 101. A metallic radioactive transuranic element of the actinides, mendelevium is synthesized by bombarding einsteinium with alpha particles and was named after Dmitri Mendeleev. Notable characteristics Researchers have shown that mendelevium has a moderately stable dipositive (II) oxidation state in addition to the more characteristic (for actinide elements) tripositive (III) oxidation state. ²⁵⁶Md has been used to find out some of the chemical properties of this element while in an aqueous solution. There are no other uses of mendelevium and only trace amounts of the element have ever been produced. History Mendelevium (for Dmitri Mendeleev, surname commonly spelt as Mendeleev, Mendeleyev, Mendeléef, or even Mendelejeff, and first name sometimes spelt as Dmitry or Dmitriy) was first synthesized by Albert Ghiorso (team leader), Glenn T. Seaborg, Bernard Harvey, Greg Choppin, and Stanley G. Thompson in early 1955 at the University of California, Berkeley. The team produced ²⁵⁶Md (half-life of 76 minutes) when they bombarded an ²⁵³Es target with alpha particles (helium nuclei) in the Berkeley Radiation Laboratory's 60-inch cyclotron (²⁵⁶Md was the first element to be synthesized one-atom-at-a-time). Element 101 was the ninth transuranic element synthesized. Isotopes 15 radioisotopes of mendelevium have been characterized, with the most stable being ²⁵⁸Md with a half-life of 51.5 days, ²⁶⁰Md with a half-life of 31.8 days, and ²⁵⁷Md with a half-life of 5.52 hours. All of the remaining radioactive isotopes have half-lives that are less than 97 minutes, and the majority of these have half-lives that are less than 5 minutes. This element also has 1 meta state, ^258mMd (t_½ 57 minutes). The isotopes of mendelevium range in atomic weight from 245.091 u (²⁴⁵Md) to 260.104 u (²⁶⁰Md). References Los Alamos National Laboratory - Mendelevium Guide to the Elements - Revised Edition, Albert Stwertka, (Oxford University Press; 1998) ISBN 0-19-508083-1 It's Elemental - Mendelevium External links WebElements.com - Mendelevium Category:Actinides Category:Chemical elements Category:Synthetic elements ar:مندليفيوم az:Mendeleyevum bn:মেন্ডেলেভিয়াম be:Мендзялевій bs:Mendeljejevijum ca:Mendelevi cs:Mendelevium co:Mendeleviu da:Mendelevium de:Mendelevium et:Mendeleevium el:Μεντελέβιο es:Mendelevio eo:Mendelevio eu:Mendelebio fa:مندلویوم fr:Mendélévium fur:Mendelevi gv:Mendelevium gl:Mendelevio ko:멘델레븀 hy:Մենդելեվիում hr:Mendelevij it:Mendelevio he:מנדלביום jv:Mendelevium la:Mendelevium lv:Mendeļejevijs lb:Mendelevium lt:Mendelevis jbo:jinmrmendelevi hu:Mendelévium ml:മെന്‍ഡെലീവിയം nl:Mendelevium ja:メンデレビウム no:Mendelevium nn:Mendelevium pl:Mendelew pt:Mendelévio ru:Менделевий scn:Mendeleviu sk:Mendelevium sl:Mendelevij sr:Мендељејевијум sh:Mendeljejevijum fi:Mendelevium sv:Mendelevium th:เมนเดลีเวียม tr:Mendelevyum uk:Менделєвій zh:钔 From Perodic Table Fresh copy to be cached until 9:59:16 AM 80 hits This Page: Edit \| History This Wiki: Home \| Related To Mendelevium \| Index \| Recent Changes \| Random Page \| Search Login \| Create New Wiki \| Wiki List 1/7/2009 1:59 AM v0.61.106 ADBEFEED
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