Holmium vs Hafnium

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PropertyHo HolmiumHf Hafnium
Atomic number6772
SymbolHoHf
NameHolmiumHafnium
Categorylanthanidetransition-metal
Standard Atomic Weight164.93033 u178.49 u
Period66
GroupN/A4
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f11[Xe]6s24f145d2
Oxidation states[0, 1, 2, 3][-2, 0, 1, 2, 3, 4]
Electronegativity (Pauling)1.231.3
Electron affinity0.338 eV0.178 eV
Density8800 kg/m³1.330000e+4 kg/m³
Melting point1473.85 °C2232.85 °C
Boiling point2699.85 °C4602.85 °C
Discovery year18781911