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Mendelevium


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Atomic symbol: Md
Atomic number: 101
Atomic weight: (258)
Atomic volume: ?
Density: ?
Period Number: 7
Group number: none
Group name: Rare Earth, Actinides
Element classification: Metal


States


Phase at room temperature: Solid
Melting Point: K
Boiling point: K
Heat of fusion: ?
Heat of vaporization: ?


Energies


Ionization Energy: 6.58 eV
1st ionization energy: 635 kJ/mole
2nd ionization energy: kJ/mole
3rd ionization energy: kJ/mole
Electronegativity: 1.3
Electron affinity: kJ/mole
Specific heat: ?
Heat atomization: kJ/mole atoms


Oxidation & Electrons


Shells: 2,8,18,32,31,8,2
Electron Shell Configuration: [Rn] 5f13 7s2
Minimum oxidation number: 0
Maximum oxidation number: 3
Minimum common oxidation number: 0
Maximum common oxidation no: 3


Appearance & Characteristics


Structure:: ?
Color: ?
Hardness: mohs
Toxicity: ?
Characteristics: Radioactive
Uses: ?


Reactions


Reaction with air: ?
Reaction with 6M HCl: ?
Reaction with 15M HNO3: ?
Reaction with 6M NaOH: ?


Other Forms


Number of isotopes: 0
Oxide(s): ?
Hydride(s): ?
Chloride(s): ?


Radius


Atomic Radius: pm
Ionic radius (1- ion): pm
Ionic radius (1+ ion): pm
Ionic radius (2- ion): pm
Ionic radius (2+ ion): pm
Ionic radius (3+ ion): pm


Conductivity


Thermal conductivity: J/m-sec-deg
Electrical conductivity: 1/mohm-cm
Polarizability: 18.2 A^3


Abundance


Source: Synthetic
Relative abundance solar system: log
Abundance earth's crust: log
Estimated crustal abundance: Not Applicable
Estimated oceanic abundance: Not Applicable
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


History


(Dmitri Mendeleev) Mendelevium, the ninth transuranium element of the actinide series discovered, was first identified by Ghiorso, Harvey, Choppin, Thompson, and Seaborg in early in 1955 during the bombardment of the isotope 253Es with helium ions in the Berkeley 60-inch cyclotron. The isotope produced was 256Md, which has a half-life of 76 min. This first identification was notable in that 256Md was synthesized on a one-atom-at-a-time basis.


Properties


Experiments seem to show that the element possesses a moderately stable dipositive (II) oxidation state in addition to the tripositive (III) oxidation state, which is characteristic of the actinide elements.


Uses


256Md has been used to elucidate some of the chemical properties of mendelevium in aqueous solution.


Isotopes


Fourteen isotopes are now recognized. 258Md has a half-life of 2 months. This isotope has been produced by the bombardment of an isotope of einsteinium with ions of helium. Eventually enough 258Md should be made to determine its physical properties.

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