Palladium
46
Pd
Gruppe
10
Periode
5
Blok
d
Protoner
Elektroner
Neutroner
46
46
60
Generelle Egenskaber
Atomnummer
46
Atommasse
106,42
Masseantal
106
Kategori
Overgangsmetaller
Farve
Sølv
Radioaktiv
Nej
Palladium was named after the asteroid Pallas; Pallas was the Greek goddess of wisdom
Krystalstruktur
Fladecentreret 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.
Elektroner i hver skal
2, 8, 18, 18
Elektronkonfiguration
[Kr] 4d10
In the late 1800s, palladium was more expensive than platinum
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
12,02 g/cm3
Smeltepunkt
1828,05 K | 1554,9 °C | 2830,82 °F
Kogepunkt
3236,15 K | 2963 °C | 5365,4 °F
Smeltevarme
16,7 kJ/mol
Fordampningsvarme
380 kJ/mol
Varmefylde
0,244 J/g·K
Forekomst i jordskorpen
6,3×10-7%
Forekomst i universet
2×10-7%
CAS-nummer
7440-05-3
PubChem CID-nummer
23938
Atomare egenskaber
Atomradius
137 pm
Kovalent radius
139 pm
Elektronegativitet
2,2 (Paulings skala)
Ioniseringspotentiale
8,3369 eV
Atomvolumen
8,9 cm3/mol
Varmeledningsevne
0,718 W/cm·K
Oxidationstrin
2, 4
Anvendelser
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
Isotoper
Stabile isotoper
102Pd, 104Pd, 105Pd, 106Pd, 108Pd, 110PdUstabile isotoper
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