Reniu
75
Re
Grupă
7
Perioadă
6
Bloc
d
Protoni
Electroni
Neutroni
75
75
111
Proprietăți Generale
Număr atomic
75
Masă atomică
186,207
Numar de masa
186
Categorie
Metale de tranziție
Culoare
Gri
Radioactive
Nu
Din cuvântul latin Rhenus, însemnând Rin
Structură cristalină
Sistemul Hexagonal
Istoric
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.
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.
Electroni pe nivelul de energie
2, 8, 18, 32, 13, 2
Configurație electronică
[Xe] 4f14 5d5 6s2
Chile has the world's largest rhenium reserves
Proprietăți Fizice
Fază
Solid
Densitate
21,02 g/cm3
Punct de topire
3459,15 K | 3186 °C | 5766,8 °F
Punct de fierbere
5869,15 K | 5596 °C | 10104,8 °F
Energie de fuziune
33 kJ/mol
Energie de evaporare
705 kJ/mol
Căldură specifică
0,137 J/g·K
Abundența în scoarța Pământului
2,6×10-7%
Abundența în Univers
2×10-8%
Credite imagine: 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
Numarul CAS
7440-15-5
Număr CID PubChem
23947
Proprietăți Atomice
Rază atomică
137 pm
Rază de covalență
151 pm
Electronegativitate
1,9 (Scara lui Pauling)
Potențial de ionizare
7,8335 eV
Volum molar
8,85 cm3/mol
Conductivitate termică
0,479 W/cm·K
Număr de oxidare
-3, -1, 1, 2, 3, 4, 5, 6, 7
Aplicații
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.
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
Izotopi
Izotopi stabili
185ReIzotopi instabili
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