Periodic Table
58
Ce
140.12
Cerium
LanthanoidOnly common Ln with stable +4 (4f⁰); catalytic converters.
Electronic Configuration
[Xe] 4f¹ 5d¹ 6s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹ 5d¹ 6s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
19e⁻n=4
9e⁻n=5
2e⁻n=6
Properties
Atomic number
58
Atomic mass
140.12 u
Category
Lanthanoid
Block / Group / Period
f · — · 6
Valence electrons
2
Oxidation states
+3, +4
Electronegativity
1.12
Atomic radius
185 pm
Ionization energy
534 kJ/mol
Electron affinity
50 kJ/mol
Melting point
1068 K / 795 °C
Boiling point
3716 K / 3443 °C
Density
6.77 g/cm³
State at 25 °C
solid
Personal Notes
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