Rodium
45
Rh
Ryhmä
9
Jakso
5
Lohko
d
Protonia
Elektronit
Neutronia
45
45
58
Yleiset ominaisuudet
Järjestysluku
45
Atomipaino
102,9055
Massaluku
103
Luokka
Siirtymäalkuaineet
Väri
Hopea
Radioaktiivisuus
Ei
From the Greek word rhodon, rose
Kiderakenne
Pintakeskinen kuutiollinen
Historia
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.
Elektroneja elektronikuorilla
2, 8, 18, 16, 1
Orbitaalirakenne
[Kr] 4d8 5s1
Rhodium metal does not normally form an oxide, even when heated
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
12,41 g/cm3
Sulamispiste
2237,15 K | 1964 °C | 3567,2 °F
Kiehumispiste
3968,15 K | 3695 °C | 6683 °F
Sulamislämpö
21,7 kJ/mol
Höyrystymislämpö
495 kJ/mol
Ominaislämpökapasiteetti
0,243 J/g·K
Esiintyvyys maankuoressa
7×10-8%
Esiintyvyys maailmankaikkeudessa
6×10-8%
CAS-numero
7440-16-6
PubChem CID-numero
23948
Atomiominaisuudet
Atomisäde
134 pm
Kovalenttisäde
142 pm
Elektronegatiivisuus
2,28 (Paulingin asteikko)
Ionisoitumispotentiaali
7,4589 eV
Moolitilavuus
8,3 cm3/mol
Lämmönjohtavuus
1,5 W/cm·K
Hapetusluvut
-1, 1, 2, 3, 4, 5, 6
Käyttö
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
Isotooppi
Vakaat isotoopit
103RhEpävakaat isotoopit
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