Rhodium

45
Rh
Gruppe
9
Periode
5
Blok
d
Protons
Electrons
Neutrons
45
45
58
General Properties
Atomnummer
45
Atommasse
102,9055
Mass Number
103
Kategori
Overgangsmetaller
Farve
Silver
Radioactive
Nej
From the Greek word rhodon, rose
Krystalstruktur
Fladecentreret Kubisk
History
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.
Elektroner i hver skal
2, 8, 18, 16, 1
Elektronkonfiguration
[Kr] 4d8 5s1
Rh
Rhodium metal does not normally form an oxide, even when heated
Physical Properties
Tilstandsform
Fast stof
Massefylde
12,41 g/cm3
Smeltepunkt
2237,15 K | 1964 °C | 3567,2 °F
Kogepunkt
3968,15 K | 3695 °C | 6683 °F
Smeltevarme
21,7 kJ/mol
Fordampningsvarme
495 kJ/mol
Varmefylde
0,243 J/g·K
Abundance in Earth's crust
7×10-8%
Abundance in Universe
6×10-8%
Rhodium
Billede akkrediteringer: Wikimedia Commons (Alchemist-hp)
Rhodium powder
CAS Number
7440-16-6
PubChem CID Number
23948
Atomic Properties
Atomradius
134 pm
Kovalent radius
142 pm
Elektronegativitet
2,28 (Paulings skala)
Ionization Potential
7,4589 eV
Atomic Volume
8,3 cm3/mol
Varmeledningsevne
1,5 W/cm·K
Oxidationstrin
-1, 1, 2, 3, 4, 5, 6
Applications
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 considered to be non-toxic
Isotoper
Stable Isotopes
103Rh
Unstable Isotopes
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