General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Palladium Symbol Pd
atomic number 46 Atomic weight 106.4
Density @ 293 K 12.02 g/cm3 Atomic volume 8.9 cm3/mol
Group Trans. Met. discovered 1803


state (s, l, g) s
melting point 1827.2 K boiling point 3213 K
Heat of fusion 17.60 kJ/mol Heat of vaporization 357.0 kJ/mol
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1st ionization energy 804.7 kJ/mole electronegativity 2.2
2nd ionization energy 1894 kJ/mole electron affinity 53.7 kJ/mole
3rd ionization energy 3177.2 kJ/mole Specific heat 0.24 J/gK
heat atomization 378 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,18 electron configuration [Kr] 4d10
minimum oxidation number 0 maximum oxidation number 4
min. common oxidation no. 0 max. common oxidation no. 4
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Appearance & Characteristics

structure fcc: face-centered cubic color silvery-white
uses catalysts, dental crowns toxicity
hardness 4.8 mohs characteristics absorbs H2


reaction with air mild, w/ht, = PdO reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 mild, = Pd(NO3)2
reaction with 6M NaOH none
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Other Forms

number of isotopes 6 hydride(s) PdHx x<1 /td non-stoich>
oxide(s) PdO chloride(s) PdCl2


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius 137 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) 100 pm ionic radius (3+ ion) 90 pm
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thermal conductivity 71.8 J/m-sec-deg electrical conductivity 94.8 1/mohm-cm
polarizability 4.8 A^3


source nickel ores (sulfides) rel. abund. solar system 0.143 log
abundance earth's crust -2 log cost, pure 15 $/100g
cost, bulk 290 $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.