Properties

CAS Number7440-10-0
PubChem CID23942
Atomic Radius182
Atomic Volume20.8
Atomic Weight140.908
Blockf
Boiling Point3,520
Bulk Modulus
CategoryLanthanides
Crystal StructureSimple Hexagonal
ColorSilver
Covalent Radius203
Density6.773
Electrical Resistivity
Electron Configuration[Xe] 4f3 6s2
Electrons per shell2, 8, 18, 21, 8, 2
Electronegativity1.13
Electrons59
Groupna
Heat of Fusion6.9
Heat of Vaporization330
Ionization Potential5.473
Magnetic Ordering
Magnetic Susceptibility
Mass140.908
Mass Number59
Melting Point935
NamePraseodymium
Neutrons82
Atomic Number141
Oxidation States2, 3, 4
Period6
PhaseSolid
Poisson Ratio
Protons59
Shear Modulus
Specific Heat Capacity0.193
SymbolPr
Thermal Conductivity0.125
Van der Waals radius
Young's Modulus
Abundance
Abundance in Earth's crust0.00086%
Abundance in Universe2×10-7%
Pr Praseodymium 59 140.90765 6 f 59 931.0 3017.0 [Xe] 4f3 6s2 2 8 18 21 8 2 6.77 0.00086% Silver Hexagonal 1.1 {"1":"527","2":"1020","3":"2086","4":"3761","5":"5551"} 527 50 +3,4 1.82 20.8 10.04 332.63 0.193 12.5 0 Solid, Conductor, Lanthanide, Stable, Natural pra-si-eh-DIM-i-em Silvery white, moderately soft, malleable, ductile metal. Used with neodymium to make lenses for glass maker's goggles since it filters out the yellow light present in glass blowing. Alloyed with magnesium creates a high-strength metal used in aircraft engines. Makes up 5% of Mich metal. Obtained from same salts as neodymium. IL06CzXF3ns Praseodymium
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. Palladium was named after the asteroid Pallas; Pallas was the Greek goddess of wisdom 59 1885 Carl F. Auer von Welsbach Austria From the Greek words "prasios didymos" meaning "green twin"

Isotopes of Palladium

Standard Atomic Weight

140.90766(2)

Stable Isotopes

141Pr

Unstable Isotopes

121Pr 122Pr 123Pr 124Pr 125Pr 126Pr 127Pr 128Pr 129Pr 130Pr 131Pr 132Pr 133Pr 134Pr 135Pr 136Pr 137Pr 138Pr 139Pr 140Pr 142Pr 143Pr 144Pr 145Pr 146Pr 147Pr 148Pr 149Pr 150Pr 151Pr 152Pr 153Pr 154Pr 155Pr 156Pr 157Pr 158Pr 159Pr

Palladium is considered to be of low toxicity
In the late 1800s, palladium was more expensive than platinum
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.