Periodic Table
64
Gd
157.25
Gadolinium
Lanthanoid4f⁷5d¹ (half-filled stability); MRI contrast agent.
Electronic Configuration
[Xe] 4f⁷ 5d¹ 6s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f⁷ 5d¹ 6s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
25e⁻n=4
9e⁻n=5
2e⁻n=6
Properties
Atomic number
64
Atomic mass
157.25 u
Category
Lanthanoid
Block / Group / Period
f · — · 6
Valence electrons
2
Oxidation states
+3
Electronegativity
1.2
Atomic radius
233 pm
Ionization energy
593 kJ/mol
Electron affinity
50 kJ/mol
Melting point
1585 K / 1312 °C
Boiling point
3546 K / 3273 °C
Density
7.895 g/cm³
State at 25 °C
solid
Personal Notes
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