Rodiu
45
Rh
Grupă
9
Perioadă
5
Bloc
d
Protoni
Electroni
Neutroni
45
45
58
Proprietăți Generale
Număr atomic
45
Masă atomică
102,9055
Numar de masa
103
Categorie
Metale de tranziție
Culoare
Argint
Radioactive
Nu
Din cuvântul grecesc rhodon, trandafir
Structură cristalină
Față Centrată Cubic
Istoric
Rhodium was discovered in 1803 by William Hyde Wollaston in London.
He used crude platinum ore presumably obtained from South America.
The introduction of the three way catalytic converter by Volvo in 1976 increased the demand for rhodium.
He used crude platinum ore presumably obtained from South America.
The introduction of the three way catalytic converter by Volvo in 1976 increased the demand for rhodium.
Electroni pe nivelul de energie
2, 8, 18, 16, 1
Configurație electronică
[Kr] 4d8 5s1
Rhodium metal does not normally form an oxide, even when heated
Proprietăți Fizice
Fază
Solid
Densitate
12,41 g/cm3
Punct de topire
2237,15 K | 1964 °C | 3567,2 °F
Punct de fierbere
3968,15 K | 3695 °C | 6683 °F
Energie de fuziune
21,7 kJ/mol
Energie de evaporare
495 kJ/mol
Căldură specifică
0,243 J/g·K
Abundența în scoarța Pământului
7×10-8%
Abundența în Univers
6×10-8%
Numarul CAS
7440-16-6
Număr CID PubChem
23948
Proprietăți Atomice
Rază atomică
134 pm
Rază de covalență
142 pm
Electronegativitate
2,28 (Scara lui Pauling)
Potențial de ionizare
7,4589 eV
Volum molar
8,3 cm3/mol
Conductivitate termică
1,5 W/cm·K
Număr de oxidare
-1, 1, 2, 3, 4, 5, 6
Aplicații
The element's major use is as one of the catalysts in the three-way catalytic converters in automobiles.
Rhodium is used as an alloying agent for hardening and improving the corrosion resistance of platinum and palladium.
It is also used as a filter in mammography systems because of the characteristic X-rays it produces.
Rhodium is also used for jewelry and for decorations.
Rhodium is used as an alloying agent for hardening and improving the corrosion resistance of platinum and palladium.
It is also used as a filter in mammography systems because of the characteristic X-rays it produces.
Rhodium is also used for jewelry and for decorations.
Rhodium is considered to be non-toxic
Izotopi
Izotopi stabili
103RhIzotopi instabili
89Rh, 90Rh, 91Rh, 92Rh, 93Rh, 94Rh, 95Rh, 96Rh, 97Rh, 98Rh, 99Rh, 100Rh, 101Rh, 102Rh, 104Rh, 105Rh, 106Rh, 107Rh, 108Rh, 109Rh, 110Rh, 111Rh, 112Rh, 113Rh, 114Rh, 115Rh, 116Rh, 117Rh, 118Rh, 119Rh, 120Rh, 121Rh, 122Rh