Periodic Table of the Elements
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Bottom FACULTY OF CHEMICAL TECHNOLOGY o PERIODIC TABLE OF THE ELEMENTS Bottom
  A B C D E F G H I J K L M N O P R S T U V X Z  
Periodic Table of the Elements Tableau périodique des éléments Periodni sustav elemenata Tavola periodica degli elementi Das Periodensystem der Elemente
Rhenium Rhénium Renij Renio Rhenium

 
Atomic number: 75
Group numbers: 7
Period: 6
 
Discovery date: 1925
Re

Rhenium
NEIGHBOURS
42
Mo
 43
Tc
 44
Ru
74
W
 75
Re
 76
Os
106
Sg
 107
Bh
 108
Hs


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Rhenium was discovered by Walter Noddack, Ida Tacke and Otto Berg (Germany) in 1925. The origin of the name comes from the Latin word Rhenus meaning river Rhine. It is rare and costly, dense, silvery-white metal. Tarnishes in moist air. Resists corrosion and oxidation. Dissolves in nitric and sulfuric acids. Has a very high melting point.
Bottom TRANSITION ELEMENT: MANGANESE GROUP Top

Relative atomic mass: 186.207(1) Electronic configuration: [Xe] 4f14 5d5 6s2
Formal oxidation number: +4 +6 +7 Electronegativities: 1.9
Thermal conductivity: 47.9 W m-1 K-1 Electrical resistivity (20 °C): 19.3 μΩcm
Atomic radius: 137.1 pm Standard state (20 °C): solid
Density (g dm-3): 21020 (293 K)
18900 (m.p.)		 Molar volume (cm3 mol-1): 8.86 (293 K)
9.85 (m.p.)


Bottom THERMAL PROPERTIES Top

Melting point: 3186 °C Heat of fusion: 33.1 kJ mol-1
Boiling point: 5596 °C Heat of vaporization: 704.25 kJ mol-1
Critical temperature: 20227 °C Heat of atomization: 769 kJ mol-1


Bottom IONIZATION ENERGIES AND ABUNDANCE Top

1st ionization energy: 755.82 kJ mol-1 Abundance of element (air): - ppm
2nd ionization energy: - kJ mol-1 Abundance of element (Earth's crust): 0.0005 ppm
3rd ionization energy: - kJ mol-1 Abundance of element (oceans): 1E-10 ppm


Bottom ISOTOPES Top

Isotopes Relative atomic mass Abundance (%)
185Re184.952956(3)37.40(2)
187Re186.955751(3)62.60(2)


Bottom MINERALS AND USES Top

Rhenium is found in small amounts in gadolinite and molybdenite. Mixed with tungsten or platinum to make filaments for mass spectrographs. Its main value is as a trace alloying agent for hardening metal components that are subjected to continuous frictional forces. The price of 99.99 % pure rhenium slug is 503.00 € for 50 g.

Bottom REDUCTION POTENTIALS Top

Balanced half-reaction   Eo / V      Annotation
Re3+ +3e- = Re(s) +0.3  
ReO2(s) + 4H+ + 4e- = Re(s) + 2H2O +0.26  
ReO4- + 8H+ + 7e- = Re(s) + 4H2O +0.37  
ReO4- + 4H2O + 7e- = Re(s) + 8OH- - 0.584  
ReO4- + 4H+ + 3e- = ReO2(s) + 2H2O +0.51  
ReO4- + 2H2O + 3e- = ReO2(s) + 4OH- - 0.595  
ReO4- + 2H+ + e- = ReO3(s) + 2H2O +0.77  

 

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