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Information valid for Eu-152 unless otherwise noted

Basic Information

Symbol: Eu
Atomic Number: 63
Mass: 151.964
Melting Point: 822.0 C
Boiling Point: 1597.0 C
Number of Protons/Electrons: 63
Number of Neutrons: 89
Classification: Rare Earth
Crystal Structure: Cubic
Density @ 293 K: 5.259 g/cm3
Color: silver

Atomic Structure

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

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 25
    Fifth Energy Level: 8
    Sixth Energy Level: 2


Isotope Half Life
Eu-147 24.4 days
Eu-148 54.5 days
Eu-149 93.1 days
Eu-150 36.0 years
Eu-151 Stable
Eu-152 13.5 years
Eu-152m 9.3 hours
Eu-153 Stable
Eu-154 8.6 years
Eu-155 7.4 years
Eu-156 15.2 days


Date of Discovery: 1901
Discoverer: Eugene Demarcay
Name Origin: Europe
Uses: color televisions
Obtained From: Man-made