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Mendelevium (Md)

From Wikipedia, the free encyclopediaMendelevium is a synthetic element with chemical symbol Md (formerly Mv) and atomic number 101. A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. It is the antepenultimate actinide and the ninth transuranic element.

Mendelevium in the periodic table

SymbolMd
Atomic number101
Group0
Period7
Blockf
Element categoryActinide

Physical properties

Phase at STPSolid
Density g/cm3
Atomic weight258 u
Melting point1100 K
826.85 °C
1520.33 °F
Boiling point K
°C
°F

Atomic properties

Electronegativity (Pauling Scale)1.3
Electron affinity93.91 kJ/mol
Oxidation states+2, +3
()
Ionization energies
1635 kJ/mol
21235 kJ/mol
32470 kJ/mol
43840 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f13 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f13 6s2 6p6 7s2
Electrons per shell2, 8, 18, 32, 31, 8, 2

History

Discovered1955
Discovered byLawrence Berkeley National Laboratory
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