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101Md258.000
Mendelevium
ActinideMendelevium 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.
Phase: Solid
2, 8, 18, 32, 31, 8, 2
Physical Properties
Atomic Mass258 u
Melting Point1100 K
Period7
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f13
Semantic Config[Rn] 5f13 7s2
Shells2, 8, 18, 32, 31, 8, 2
Electron Affinity93.91 kJ/mol
Electronegativity1.3
Ionization Energies
IE1: 635 kJ/mol
Discovery
Discovered byLawrence Berkeley National Laboratory