Element Rhenium

Rhenium ElementIt is a chemical element with the symbol Re and atomic number 75. It is a silvery-gray, heavy, third-row transition metal in group 7 of the periodic table.
Its usual commercial form is a powder, but this element can be consolidated by pressing and sintering in a vacuum or hydrogen atmosphere.
It can be prepared by many routes, a typical method is the reaction of Re2O7 and tetramethyltin:
Nickel-based superalloys of rhenium are used in the combustion chambers, turbine blades, and exhaust nozzles of jet engines. These alloys contain up to 6% rhenium, making jet engine construction the largest single use for the element.

Names and Identifiers

Chemical Formula:Re
CAS:7440-15-5
Molecular Weight:186.207 g/mol
EC Number :231-124-5
MDL Number:MFCD00011195
Color:grayish white/ silvery-white
Other Names:Rhénium, Renio, Rênio
PubChem CID:23947
IUPAC Name:Rhenium
Inchl:InChI=1S/Re
InChI Key:WUAPFZMCVAUBPE-UHFFFAOYSA-N
Canonical SMILES:[Re]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:21.02 g/cm³
Boiling Point:5903 K ​(5630 °C, ​10,170 °F)
Melting Point:3459 K ​(3186 °C, ​5767 °F)
Molecular Formula:Re
Flash Point:n/a
Exact Mass:186.955597
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H228
Precautionary Statements:P210
Hazard Codes:C,F
Risk Phrases:R34
Safety Phrases:S16-S45-S36/37/39-S26-S33-S27
RIDADR:UN 3178 4.1/PG 2
WGK Germany:3
RTECS:VI0780000
Packaging Group:III
Hazard Class:8

Rhenium has one stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in two other elements (indium and tellurium).
Naturally occurring rhenium is only 37.4% 185Re, and 62.6% 187Re, which is unstable but has a very long half-life (≈1010 years).

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
185Re184.952951 (3)37.40 (2)5/23.1871
187Re186.955744 (3)62.60 (2)5/23.2197

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
182Re181.95122.67 dEC to 182W72.8
183Re182.9508270 dEC to 183W5/23.17
184Re183.9525238 dEC to 184W32.53
186Re185.9549863.78 dEC to 186W; β to 186Os11.739
188Re187.95811216.94 hβ to 188Os11.788
189Re188.95922824 hβ to 189Os5/2

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