Technetium vs Francium

← Back to Periodic Table
PropertyTc TechnetiumFr Francium
Atomic number4387
SymbolTcFr
NameTechnetiumFrancium
Categorytransition-metalalkali-metal
Standard Atomic Weight98 u223 u
Period57
Group71
Blockss
Phase at STPsolidsolid
Electron configuration[Kr]5s24d5[Rn]7s1
Oxidation states[-3, -1, 1, 2, 3, 4, 5, 6, 7][1]
Electronegativity (Pauling)1.90.7
Electron affinity0.55 eV0.491 eV
Density1.100000e+4 kg/m³1870 kg/m³
Melting point2156.85 °C26.85 °C
Boiling point4264.85 °C-273.15 °C
Discovery year19371939