Holmium vs Roentgenium

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PropertyHo HolmiumRg Roentgenium
Atomic number67111
SymbolHoRg
NameHolmiumRoentgenium
Categorylanthanidetransition-metal
Standard Atomic Weight164.93033 u281 u
Period67
GroupN/A11
Blockss
Phase at STPsolidN/A
Electron configuration[Xe]6s24f11[Rn] 7s2 5f14 6d9(predicted)
Oxidation states[0, 1, 2, 3][-1, 1, 3, 5]
Electronegativity (Pauling)1.23N/A
Electron affinity0.338 eV1.6 eV
Density8800 kg/m³2.870000e+4 kg/m³
Melting point1473.85 °C-273.15 °C
Boiling point2699.85 °C-273.15 °C
Discovery year18781994