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Information valid for Ho-165 unless otherwise noted

Basic Information

Symbol: Ho
Atomic Number: 67
Mass: 164.93
Melting Point: 1470
Boiling Point: 2720
Number of Protons/Electrons: 67
Number of Neutrons: 98
Classification: Rare Earth
Crystal Structure: Hexagonal
Density: 8.54
Color: Silver

Atomic Structure

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

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 29
    Fifth Energy Level: 8
    Sixth Energy Level: 2


Isotope Half Life
Ho-163 4570 years
Ho-165 Stable
Ho-166 1.1 days
Ho-166m 1200 years


Date of Discovery: 1878
Discoverer: J.L. Soret
Name Origin: Form the Latin word Holmia (Stockholm)
Uses: nuclear reactors
Obtained From: gadolinite