Dysprosium vs Holmium

Side-by-side comparison of Dysprosium (Dy, element 66) and Holmium (Ho, element 67) by atomic structure and physical properties.

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PropertyDy Dysprosium Ho Holmium
Atomic number6667
SymbolDyHo
NameDysprosiumHolmium
Categorylanthanidelanthanide
Standard Atomic Weight162.5 u164.93033 u
Period66
GroupN/AN/A
Blockff
Phase at STPSolidSolid
Electron configuration[Xe]4f106s2[Xe]4f116s2
Oxidation states[0, 1, 2, 3, 4][0, 1, 2, 3]
Electronegativity (Pauling)1.221.23
Electron affinity0.015 eV0.338 eV
Density8550 kg/m³8800 kg/m³
Melting point1411.85 °C1473.85 °C
Boiling point2566.85 °C2699.85 °C
Discovery year18861878

Key Differences

PropertyDy DysprosiumHo Holmium
Standard Atomic Weight162.5 u ↓ lower164.93033 u ↑ higher
Density8550 kg/m³ ↓ lower8800 kg/m³ ↑ higher
Melting point1411.85 °C ↓ lower1473.85 °C ↑ higher
Boiling point2566.85 °C ↓ lower2699.85 °C ↑ higher
Electronegativity (Pauling)1.22 ↓ lower1.23 ↑ higher
Electron affinity0.015 eV ↓ lower0.338 eV ↑ higher
Electron configuration[Xe]4f106s2 [Xe]4f116s2
Discovery year1886 1878