Cerium

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	58
Element	Cerium
Symbol	Ce
Atomic Mass	140.116 u
Number of Neutrons	82 (most common isotope, Cerium-140)
Number of Protons	58
Number of Electrons	58
Period	6
Group	Lanthanide (no fixed group number)
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Lanthanide
Atomic Radius	235 pm
Electronegativity	1.12 (Pauling scale)
First Ionization Energy	5.539 eV
Density	6.77 g/cm³
Melting Point	798 °C
Boiling Point	3443 °C
Number of Isotopes	4 stable (Ce-136, Ce-138, Ce-140, Ce-142)
Discoverer	Martin Heinrich Klaproth, Jöns Jacob Berzelius, Wilhelm Hisinger
Year	1803
Specific Heat	0.192 J/g·K
Number of Shells	6
Number of Valence Electrons	4