Molybdenum vs Francium

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PropertyMo MolybdenumFr Francium
Atomic number4287
SymbolMoFr
NameMolybdenumFrancium
Categorytransition-metalalkali-metal
Standard Atomic Weight95.95 u223 u
Period57
Group61
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s14d5[Rn]7s1
Oxidation states[-4, -2, -1, 0, 1, 2, 3, 4, 5, 6][1]
Electronegativity (Pauling)2.160.7
Electron affinity0.744 eV0.491 eV
Density1.020000e+4 kg/m³1870 kg/m³
Melting point2622.85 °C26.85 °C
Boiling point4638.85 °C-273.15 °C
Discovery year17781939