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Information valid for Re-186 unless otherwise noted

Basic Information

Symbol: Re
Atomic Number: 75
Mass: 186.207
Melting Point: 3180.0 C
Boiling Point: 5627.0 C
Number of Protons/Electrons: 75
Number of Neutrons: 111
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 21.02 g/cm3
Color: silverish

Atomic Structure

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

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 13
    Sixth Energy Level: 2


Isotope Half Life
Re-182 2.67 days
Re-182m 12.7 hours
Re-183 70.0 days
Re-184 38.0 days
Re-184m 165.0 days
Re-185 Stable
Re-186 3.77 days
Re-187 4.1E10 years
Re-188 16.94 hours


Date of Discovery: 1925
Discoverer: Walter Noddack
Name Origin: From Rhines provinces of Germany
Uses: filaments for mass spectrographs
Obtained From: gadolinite, molybdenite