Ce

Cerium

Identification

CAS Number: 7440-45-1

Discovery Year: 1803

Discoverer: W. von Hisinger, J. Berzelius, M. Klaproth

Discovery Location: Sweden/Germany

Properties

Atomic Mass: 140.116 →Density: 6.77 g/cm³ →

Crust Abundance: 66.5 mg/kg

Crystal Structure: FCC

Atomic Dimensions

Atomic Radius: 185 pm →

Atomic Radius (Rahm): 282 pm

Covalent Radius: 204 pm →

Van der Waals Radius: 242 pm

Atomic Volume: 21 cm³/mol

Lattice Constant: 5.16 Å

Thermodynamics

Melting Point: 1072 K →Boiling Point: 3699 K →Specific Heat: 0.205 J/(g·K) →Thermal Conductivity: 11.3 W/(m·K) →Heat of Fusion: 5.2 kJ/mol →Heat of Vaporization: 398 kJ/mol →

Heat of Formation: 420.1 kJ/mol

Electronic Structure

Electron Config: [Xe] 4f 5d 6s2

Block: f

Period: 6 →Electronegativity: 1.12 →Electron Affinity: 0.65 eV →

Oxidation States: +3, +4

Abundance & Geochemistry

Crust Abundance: 66.5 mg/kg

Sea Abundance: 0.0000012 mg/L

Geochemical Class: rare earth & related

Goldschmidt Class: litophile

About

Silvery metallic element, belongs to the lanthanoids. Four natural isotopes exist, and fifteen radioactive isotopes have been identified. Used in some rare-earth alloys. The oxidized form is used in the glass industry. Discovered by Martin .H. Klaproth in 1803.

Isotopes

Ce-140 140 88.45%

Ce-142 142 11.11%

Ce-138 138 0.2510%

Ce-136 136 0.1860%