Rhenium

75
Re
Gruppe
7
Periode
6
Blok
d
Protons
Electrons
Neutrons
75
75
111
General Properties
Atomnummer
75
Atommasse
186,207
Mass Number
186
Kategori
Overgangsmetaller
Farve
Grå
Radioactive
Nej
From the Latin word Rhenus meaning Rhine
Krystalstruktur
Simpel Hexagonal
History
In 1908, Japanese chemist Masataka Ogawa announced that he discovered the 43rd element.

However, later analysis indicated the presence of rhenium (element 75), not element 43.

In 1922, Walter Noddack, Ida Eva Tacke and Otto Berg announced its separation from gadolinite and gave it the present name.
Elektroner i hver skal
2, 8, 18, 32, 13, 2
Elektronkonfiguration
[Xe] 4f14 5d5 6s2
Re
Chile has the world's largest rhenium reserves
Physical Properties
Tilstandsform
Fast stof
Massefylde
21,02 g/cm3
Smeltepunkt
3459,15 K | 3186 °C | 5766,8 °F
Kogepunkt
5869,15 K | 5596 °C | 10104,8 °F
Smeltevarme
33 kJ/mol
Fordampningsvarme
705 kJ/mol
Varmefylde
0,137 J/g·K
Abundance in Earth's crust
2,6×10-7%
Abundance in Universe
2×10-8%
A
Billede akkrediteringer: Wikimedia Commons (Alchemist-hp)
A high purity rhenium single crystal made by the floating zone process, an ebeam remelted rhenium bar and as well as a high purity rhenium cube for comparison
CAS Number
7440-15-5
PubChem CID Number
23947
Atomic Properties
Atomradius
137 pm
Kovalent radius
151 pm
Elektronegativitet
1,9 (Paulings skala)
Ionization Potential
7,8335 eV
Atomic Volume
8,85 cm3/mol
Varmeledningsevne
0,479 W/cm·K
Oxidationstrin
-3, -1, 1, 2, 3, 4, 5, 6, 7
Applications
Rhenium is widely used as filaments for mass spectrographs and ion gauges.

It is also used with platinum as catalysts in the production of lead-free, high-octane gasoline.

Nickel-based superalloys of rhenium are used in the combustion chambers, turbine blades, and exhaust nozzles of jet engines.
Very little is known about the toxicity of rhenium
Isotoper
Stable Isotopes
185Re
Unstable Isotopes
160Re, 161Re, 162Re, 163Re, 164Re, 165Re, 166Re, 167Re, 168Re, 169Re, 170Re, 171Re, 172Re, 173Re, 174Re, 175Re, 176Re, 177Re, 178Re, 179Re, 180Re, 181Re, 182Re, 183Re, 184Re, 186Re, 187Re, 188Re, 189Re, 190Re, 191Re, 192Re, 193Re, 194Re