• Class: Transition Metals
• Period: 5
• IUPAC group: 10
• Traditional: VIII

• Discovered in: 1803 by Wollaston
• Origin of name: Asteroid Pallas
• Historical or alternate name:

Platinum ores & Copper-Nickel sulfide ores

Lustrous, silvery white, malleable and ductile metal. Resists corrosion; dissolves in oxydizing acids. Absorbs Hydrogen.

• Atmosphere: ~0.0 ppm
• Primitive mantle: 0.0039 ppm
• Sea water: trace ppm
• Metallic meteorite: 0.557 ppm
• Continental crust: 0.001 ppm
• Solar photosphere: 1.5 log of abundance
• Oceanic crust: <0.0002 ppm
• Solar system: 1.39 relative to Si=1.0e6

   Hazards

Metal dust is combustible. Low toxicity..

• Lower:
• Upper:

Palladium Physical Properties

 Transitional Data

• State: Solid
• Density: 12.02 g/cm3

 Molar enthalpy

• Atomization: 377.4 kJ mol-1
• Fusion: 17.2 kJ mol-1
• Vaporization: 361.5 kJ mol-1

 Transition points

• Melting point: 1827.0 K
• Boiling point: 3243.0 K
• Critical temperature: 7100.0 K

 Molar properties

• Atomic weight: 106.42 g/mole
• Molar volume: 8.918 cm3 mol-1

 Crystal structure sequence

face-centered-cubic

 Thermodynamics

• State: solid
  • Enthalpy 0
  • Gibbs function 0
  • Entropy 37.57
  • Heat Capacity 25.98

• State: gas
  • Enthalpy 378.2
  • Gibbs function 339.7
  • Entropy 167.05
  • Heat Capacity 20.786

 Miscellaneous physical

• Electrical resistivity: 10.8 µ-ohms/cm
• Debye temperature: 274.0 K
• Thermal conductivity: 71.8 W / m / K
• Coefficient of linear expansion: 11.9Coef. per K
• Mass magnetic susceptibility: 6.702e-8
• X-ray diffraction mass absorption coefficients:
• CuK: 206 (µ/p)/cm2 g-1
• MoK: 24.1 (µ/p)/cm2 g-1

Palladium Chemical Properties

 Chemical basics:

• Oxidation states: +2 +3 +4
• Molecular wt: 106.42 g/mole

 Radii

• Covalent: 128 pm
• Atomic: 137.0 pm
• Van der Waals: pm

 Ions:

• ion: +2 pm 86.0
• ion: +3 pm 76.0
• ion: +4 pm 61.5

 Covalent bonds

 Effective nuclear charge

• Slater: 4.05
• Clementi: 7.84
• Froese-Fischer: 11.11

 Electronegativity

• Pauling: 2.2
• Allred-Rochow: 1.35

 Standard reactions

Palladium Nuclear Properties

• Known 21
• Listed 8

• Known 95 - 115
• Listed 102 - 110

• % Occ.:Natural 1.02%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life: 17.0 days
  • Decay mode: E.C.,
  • Source: reactor
• Notes med

• % Occ.:Natural 11.14%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 22.33%
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 27.33%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural
• Mossbauer NRA:
• Nuclear spin/Quantum no.: 5/2
• Radioisotopes:
  • Half-life: 6.5 E6 years
  • Decay mode: Beta-
  • Source: reactor
• Notes

• % Occ.:Natural 26.46%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• % Occ.:Natural 11.72%
• Mossbauer NRA:
• Nuclear spin/Quantum no.:
• Radioisotopes:
  • Half-life:
  • Decay mode:
  • Source:
• Notes

• Isotope Cross-section 6.0±1.0 barns

• Absolute sensitivity: 2.49e-4 1H=1.0
• Relative sensitivity: 1.12e-3 1H=1.0
• Receptivity: 1.41 13C=1.0
• Magnetogyric ratio: -0.756e7 rad / T / s
• Quadropole moment: 0.8e-28 m2
• Frequency: 4.576 MHz
• Reference: (K2PdCl6)

Palladium Energy Properties

Electrons

• Ground state electron configuration: [Kr] 4d10
• Electron affinity: 98.4 kJ mol-1
• Filling orbitals:

Spectral lines

 Ionization energies

 Atomic energy levels