Mendelevium



101 nobelium
Tm
↑
Md
↓
(Upu)
General
Number mendelevium, Md, 101
actinides
Block f
Appearance unknown, probably silvery
white or metallic gray
Standard atomic weight (258)  g·mol−1
Rn] 5f13 7s2
shell 2, 8, 18, 32, 31, 8, 2
Physical properties
Phase solid
F)
Atomic properties
Oxidation states 2, 3
Electronegativity 1.3 (Pauling scale)
Ionization energies 1st: 635 kJ/mol
Miscellaneous
Magnetic ordering no data
CAS registry number 7440-11-1
Selected isotopes
Main article: Isotopes of mendelevium
iso NA half-life DM DE (MeV) DP
257Md syn 5.52 h ε 0.406 257Fm
α 7.558 253Es
SF - -
258Md syn 51.5 d ε 1.230 258Fm
260Md syn 31.8 d SF - -
α 7.000 256Es
ε - 260Fm
β- 1.000 260No
References

Mendelevium (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 transuranic element synthesized. It is used for things such as creating the rubber in tires.

Isotopes

15 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
 
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