Gadolinium vs Terbium

Side-by-side comparison of Gadolinium (Gd, element 64) and Terbium (Tb, element 65) by atomic structure and physical properties.

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PropertyGd Gadolinium Tb Terbium
Atomic number6465
SymbolGdTb
NameGadoliniumTerbium
Categorylanthanidelanthanide
Standard Atomic Weight157.25 u158.92535 u
Period66
GroupN/AN/A
Blockff
Phase at STPSolidSolid
Electron configuration[Xe]4f75d16s2[Xe]4f96s2
Oxidation states[0, 1, 2, 3][0, 1, 2, 3, 4]
Electronegativity (Pauling)1.2N/A
Electron affinity0.212 eV0.13131 eV
Density7900 kg/m³8230 kg/m³
Melting point1312.85 °C1355.85 °C
Boiling point3272.85 °C3229.85 °C
Discovery year18801843

Key Differences

PropertyGd GadoliniumTb Terbium
Standard Atomic Weight157.25 u ↓ lower158.92535 u ↑ higher
Density7900 kg/m³ ↓ lower8230 kg/m³ ↑ higher
Melting point1312.85 °C ↓ lower1355.85 °C ↑ higher
Boiling point3272.85 °C ↑ higher3229.85 °C ↓ lower
Electron affinity0.212 eV ↑ higher0.13131 eV ↓ lower
Electron configuration[Xe]4f75d16s2 [Xe]4f96s2
Discovery year1880 1843