Chemical Elements.com - Rhenium (Re)

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Basic Information

Name: Rhenium
Symbol: Re
Atomic Number: 75
Atomic Mass: 186.207 amu
Melting Point: 3180.0 °C (3453.15 K, 5756.0 °F)
Boiling Point: 5627.0 °C (5900.15 K, 10160.6 °F)
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

Number of Energy Levels: 6

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Isotopes

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

Facts

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

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