Cerium at Chemical Elements.com 


 

Basic Information


Name: Cerium
Symbol: Ce
Atomic Number: 58
Atomic Mass: 140.116 amu
Melting Point: 795.0 °C (1068.15 °K, 1463.0 °F)
Boiling Point: 3257.0 °C (3530.15 °K, 5894.6 °F)
Number of Protons/Electrons: 58
Number of Neutrons: 82
Classification:  Rare Earth
Crystal Structure: Cubic
Density @ 293 K: 6.773 g/cm3
Color: gray


Atomic Structure

[Bohr Model of Cerium]  
Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 20
    Fifth Energy Level: 8
    Sixth Energy Level: 2

Isotopes

Isotope Half Life
Ce-134 3016.0 days
Ce-136 Stable
Ce-138 Stable
Ce-139 137.6 days
Ce-140 Stable
Ce-141 32.5 days
Ce-142 Stable
Ce-143 1.4 days
Ce-144 284.6 days

Facts


Date of Discovery: 1803
Discoverer: W. von Hisinger
Name Origin: Ceres (asteroid)
Uses: heat-resistant alloys
Obtained From: monazite