Ytterbium vs Hafnium

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PropertyYb YtterbiumHf Hafnium
Atomic number7072
SymbolYbHf
NameYtterbiumHafnium
Categorylanthanidetransition-metal
Standard Atomic Weight173.054 u178.49 u
Period66
GroupN/A4
Blockss
Phase at STPsolidsolid
Electron configuration[Xe]6s24f14[Xe]6s24f145d2
Oxidation states[0, 1, 2, 3][-2, 0, 1, 2, 3, 4]
Electronegativity (Pauling)N/A1.3
Electron affinity-0.02 eV0.178 eV
Density6900 kg/m³1.330000e+4 kg/m³
Melting point818.85 °C2232.85 °C
Boiling point1195.85 °C4602.85 °C
Discovery year18781911