Lawrencium vs Rutherfordium

Side-by-side comparison of Lawrencium (Lr, element 103) and Rutherfordium (Rf, element 104) by atomic structure and physical properties.

← Back to Periodic Table
PropertyLr Lawrencium Rf Rutherfordium
Atomic number103104
SymbolLrRf
NameLawrenciumRutherfordium
Categoryactinidetransition-metal
Standard Atomic Weight266 u267 u
Period77
Group34
Blockdd
Phase at STPSolidSolid
Electron configuration[Rn]5f147s27p1[Rn]5f146d27s2
Oxidation states[3][3, 4]
Electronegativity (Pauling)N/AN/A
Electron affinity-0.31 eV0.65 eV
Density1.56e+4 kg/m³2.33e+4 kg/m³
Melting point1626.85 °C2126.85 °C
Boiling pointN/A5526.85 °C
Discovery year19611964

Key Differences

PropertyLr LawrenciumRf Rutherfordium
Standard Atomic Weight266 u ↓ lower267 u ↑ higher
Density1.56e+4 kg/m³ ↓ lower2.33e+4 kg/m³ ↑ higher
Melting point1626.85 °C ↓ lower2126.85 °C ↑ higher
Electron affinity-0.31 eV ↓ lower0.65 eV ↑ higher
Group3 4
Categoryactinide transition-metal
Electron configuration[Rn]5f147s27p1 [Rn]5f146d27s2
Discovery year1961 1964