Terbium vs Dysprosium

Side-by-side comparison of Terbium (Tb, element 65) and Dysprosium (Dy, element 66) by atomic structure and physical properties.

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PropertyTb Terbium Dy Dysprosium
Atomic number6566
SymbolTbDy
NameTerbiumDysprosium
Categorylanthanidelanthanide
Standard Atomic Weight158.92535 u162.5 u
Period66
GroupN/AN/A
Blockff
Phase at STPSolidSolid
Electron configuration[Xe]4f96s2[Xe]4f106s2
Oxidation states[0, 1, 2, 3, 4][0, 1, 2, 3, 4]
Electronegativity (Pauling)N/A1.22
Electron affinity0.13131 eV0.015 eV
Density8230 kg/m³8550 kg/m³
Melting point1355.85 °C1411.85 °C
Boiling point3229.85 °C2566.85 °C
Discovery year18431886

Key Differences

PropertyTb TerbiumDy Dysprosium
Standard Atomic Weight158.92535 u ↓ lower162.5 u ↑ higher
Density8230 kg/m³ ↓ lower8550 kg/m³ ↑ higher
Melting point1355.85 °C ↓ lower1411.85 °C ↑ higher
Boiling point3229.85 °C ↑ higher2566.85 °C ↓ lower
Electron affinity0.13131 eV ↑ higher0.015 eV ↓ lower
Electron configuration[Xe]4f96s2 [Xe]4f106s2
Discovery year1843 1886