Mendelevium (Md) - Discovery, Occurrence, Production, Properties and Applications of Mendelevium

Chemical Formula

Md

Background

Albert Ghiorso, Gregory R. Choppin, Bernard G. Harvey, Glenn T. Seaborg and Stanley G. Thompson first produced mendelevium at the University of California, Berkeley in 1955. They bombarded einsteinium-253 atoms with helium ions using a cyclotron and produced mendelevium-256 isotopes and a free neutron. The element is named after Dmitri Mendeleev, the Russian chemist who created the modern periodic table.

Basic Information

Name Mendelevium
Symbol Md
Atomic number 101
Atomic weight 258 amu
Standard state Presumably a solid at 298 K
CAS Registry ID 11/1/7440
Group name Actinoid
Period in periodic table 7
Block in periodic table f-block
Color Unknown, but probably metallic and silvery white or grey in appearance
Classification Metallic
Melting point 1100 K (827°C or 1521°F)
Boiling point Unknown
Density Unknown
Phase at room temperature Solid

Occurrence

Mendelevium is not found in nature.

Mendelevium - Periodic Table of Videos

Isotopes

Related Stories

Mendelevium consists of 16 isotopes having mass numbers from 245Md to 260Md. None of them occur naturally. The longest-lived isotopes of mendelevium are 258Md, 260Md and 259Md with the respective half-lives of 51.5 days, 31.8 days and 96 min.

Production

Mendelevium can be produced by particle bombardment of einsteinium-253 atoms with alpha-particles in a 60-inch cyclotron.

Key Properties

The following are the key properties of mendelevium:

  • It is a radioactive rare earth metal
  • It has a moderately stable divalent state in addition to a trivalent state
  • It can be reduced to its monovalent state in water-ethanol solutions.

Applications

Mendelevium is currently used for scientific research purpose only.

References

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G.P. Thomas

Written by

G.P. Thomas

Gary graduated from the University of Manchester with a first-class honours degree in Geochemistry and a Masters in Earth Sciences. After working in the Australian mining industry, Gary decided to hang up his geology boots and turn his hand to writing. When he isn't developing topical and informative content, Gary can usually be found playing his beloved guitar, or watching Aston Villa FC snatch defeat from the jaws of victory.

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