Palladium
46
Pd
Gruppe
10
Periode
5
Blokk
d
Proton
Elektron
Nøytron
46
46
60
Generelle eigenskapar
Atomnummer
46
Atommasse
106,42
Massetal
106
Kategori
Transisjonsmetall
Farge
Sølv
Radioaktiv
Nei
Palladium was named after the asteroid Pallas; Pallas was the Greek goddess of wisdom
Krystallstruktur
Flatesentrert kubisk
Historie
Palladium was discovered in 1803, in London, by English chemist William Hyde Wollaston.
He examined the residues left from platinum after dissolving it in aqua regia, a concentrated solution of hydrochloric and nitric acids.
He then isolated palladium in a series of chemical reactions.
He examined the residues left from platinum after dissolving it in aqua regia, a concentrated solution of hydrochloric and nitric acids.
He then isolated palladium in a series of chemical reactions.
Elektron per energinivå
2, 8, 18, 18
Elektronkonfigurasjon
[Kr] 4d10
In the late 1800s, palladium was more expensive than platinum
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
12,02 g/cm3
Smeltepunkt
1828,05 K | 1554,9 °C | 2830,82 °F
Kokepunkt
3236,15 K | 2963 °C | 5365,4 °F
Smeltevarme
16,7 kJ/mol
Fordampingsvarme
380 kJ/mol
Spesifikk varmekapasitet
0,244 J/g·K
Førekomst i jordskorpa
6,3×10-7%
Førekomst i universet
2×10-7%
CAS-nummer
7440-05-3
PubChem CID-nummer
23938
Atom eigenskapar
Atomradius
137 pm
Kovalent radius
139 pm
Elektronegativitet
2,2 (Paulings skala)
Ioniseringspotensial
8,3369 eV
Molart volum
8,9 cm3/mol
Termisk konduktivitet
0,718 W/cm·K
Oksidasjonstrinn
2, 4
Bruksområde
The largest use of palladium is in catalytic converters in the automobile industry.
Finely divided palladium is a good catalyst and is used for hydrogenation and dehydrogenation reactions.
The metal is used in dentistry, watch making, and in making surgical instruments and electrical contacts.
Finely divided palladium is a good catalyst and is used for hydrogenation and dehydrogenation reactions.
The metal is used in dentistry, watch making, and in making surgical instruments and electrical contacts.
Palladium is considered to be of low toxicity
Isotopar
Stabile isotopar
102Pd, 104Pd, 105Pd, 106Pd, 108Pd, 110PdUstabile isotopar
91Pd, 92Pd, 93Pd, 94Pd, 95Pd, 96Pd, 97Pd, 98Pd, 99Pd, 100Pd, 101Pd, 103Pd, 107Pd, 109Pd, 111Pd, 112Pd, 113Pd, 114Pd, 115Pd, 116Pd, 117Pd, 118Pd, 119Pd, 120Pd, 121Pd, 122Pd, 123Pd, 124Pd