Lanthanum vs Hafnium

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PropertyLa LanthanumHf Hafnium
Atomic number5772
SymbolLaHf
NameLanthanumHafnium
Categorylanthanidetransition-metal
Standard Atomic Weight138.90547 u178.49 u
Period66
GroupN/A4
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s25d1[Xe]6s24f145d2
Oxidation states[0, 1, 2, 3][-2, 0, 1, 2, 3, 4]
Electronegativity (Pauling)1.11.3
Electron affinity0.47 eV0.178 eV
Density6150 kg/m³1.330000e+4 kg/m³
Melting point917.85 °C2232.85 °C
Boiling point3463.85 °C4602.85 °C
Discovery year18391911