Pd

Palladium

Identification

CAS Number: 7440-05-3

Discovery Year: 1803

Discoverer: William Wollaston

Discovery Location: England

Properties

Atomic Mass: 106.42 →Density: 12 g/cm³ →

Crust Abundance: 0.015 mg/kg

Crystal Structure: FCC

Atomic Dimensions

Atomic Radius: 140 pm →

Atomic Radius (Rahm): 215 pm

Covalent Radius: 139 pm →

Van der Waals Radius: 210 pm

Metallic Radius: 128 pm

Atomic Volume: 8.9 cm³/mol

Lattice Constant: 3.89 Å

Thermodynamics

Melting Point: 1825 K →Boiling Point: 3413 K →Specific Heat: 0.244 J/(g·K) →Thermal Conductivity: 71.8 W/(m·K) →Heat of Fusion: 17.24 kJ/mol →Heat of Vaporization: 372.4 kJ/mol →

Heat of Formation: 376.6 kJ/mol

Electronic Structure

Electron Config: [Kr] 4d10

Block: d

Period: 5 →Group: 10 →Electronegativity: 2.2 →Electron Affinity: 0.562 eV →

Oxidation States: +2, +4

Abundance & Geochemistry

Crust Abundance: 0.015 mg/kg

Geochemical Class: noble metal

Goldschmidt Class: siderophile

About

Soft white ductile transition element. Found with some copper and nickel ores. Does not react with oxygen at normal temperatures. Dissolves slowly in hydrochloric acid. Discovered in 1803 by W.H. Wollaston.

Isotopes

Pd-106 106 27.33%

Pd-108 108 26.46%

Pd-105 105 22.33%

Pd-110 110 11.72%

Pd-104 104 11.14%

Pd-102 102 1.02%