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Information valid for Gd-157 unless otherwise noted

Basic Information

Symbol: Gd
Atomic Number: 64
Mass: 157.25
Melting Point: 1311.0 C
Boiling Point: 3233.0 C
Number of Protons/Electrons: 64
Number of Neutrons: 93
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 7.895 g/cm3
Color: Silverish

Atomic Structure

[Bohr Model of Gadolinium]
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: 9
    Sixth Energy Level: 2


Isotope Half Life
Gd-148 75.0 years
Gd-150 1800000.0 years
Gd-151 124.0 days
Gd-152 1.1E14 years
Gd-153 241.6 days
Gd-154 Stable
Gd-155 Stable
Gd-156 Stable
Gd-157 Stable
Gd-158 Stable
Gd-159 18.6 hours
Gd-160 Stable
Gd-162 8.4 minutes


Date of Discovery: 1880
Discoverer: Jean de Marignac
Name Origin: gadolinite (mineral)
Uses: magnetic
Obtained From: gadolinite