Palladium

46
Pd
Gruppe
10
Periode
5
Blok
d
Protons
Electrons
Neutrons
46
46
60
General Properties
Atomnummer
46
Atommasse
106,42
Mass Number
106
Kategori
Overgangsmetaller
Farve
Silver
Radioactive
Nej
Palladium was named after the asteroid Pallas; Pallas was the Greek goddess of wisdom
Krystalstruktur
Fladecentreret Kubisk
History
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.
Elektroner i hver skal
2, 8, 18, 18
Elektronkonfiguration
[Kr] 4d10
Pd
In the late 1800s, palladium was more expensive than platinum
Physical Properties
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
Abundance in Earth's crust
6,3×10-7%
Abundance in Universe
2×10-7%
Palladium
Billede akkrediteringer: Images-of-elements
Palladium crystal
CAS Number
7440-05-3
PubChem CID Number
23938
Atomic Properties
Atomradius
137 pm
Kovalent radius
139 pm
Elektronegativitet
2,2 (Paulings skala)
Ionization Potential
8,3369 eV
Atomic Volume
8,9 cm3/mol
Varmeledningsevne
0,718 W/cm·K
Oxidationstrin
2, 4
Applications
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.
Palladium is considered to be of low toxicity
Isotoper
Stable Isotopes
102Pd, 104Pd, 105Pd, 106Pd, 108Pd, 110Pd
Unstable Isotopes
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