Praseodymium
Praseodymium General
Name:Praseodymium | Symbol:Pr |
Type:Rare Earth, Lanthanides | Atomic weight:140.9077 |
Density @ 293 K:6.77 g/cm3 | Atomic volume:20.8 cm3/mol |
Discovered:
1885 |
Praseodymium States
State (s, l, g):solid | |
Melting point:1204.2 K | Boiling point:3293 K |
Praseodymium Energies
Specific heat capacity:0.19 J/gK | Heat of atomization:356 kJ/mole atoms |
Heat of fusion:6.890 kJ/mol | Heat of vaporization :296.80 kJ/mol |
1st ionization energy:523.2 kJ/mole | 2nd ionization energy:1018 kJ/mole |
3rd ionization energy:2086 kJ/mole | Electron affinity:50 kJ/mole |
Praseodymium Oxidation & Electrons
Shells: 2,8,18,21,8,2 | Electron configuration:[Xe] 4f3 6s2 |
Minimum oxidation number:0 | Maximum oxidation number:4 |
Min. common oxidation no.:0 | Max. common oxidation no.:3 |
Electronegativity (Pauling Scale):1.13 | Polarizability volume:28.2 Å3 |
Praseodymium Appearance & Characteristics
Structure:cp: close packed (ABCB) | Color:silvery-white |
Hardness:mohs | |
Harmful effects:
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Characteristics:
soft Uses: alloys, Welder's mask |
Praseodymium Reactions
Reaction with air:vigorous, => Pr6O11 approx | Reaction with 6 M HCl:mild, => H2, PrCl3 |
Reaction with 15 M HNO3:mild, => Pr(NO3)3 | Reaction with 6 M NaOH: |
Praseodymium Compounds
Oxide(s):PrO2 Pr6O11 | Chloride(s):PrCl3 |
Hydride(s):PrH2 PrH3 |
Praseodymium Radius
Atomic radius:182 pm | Ionic radius (1+ ion):pm |
Ionic radius (2+ ion):pm | Ionic radius (3+ ion):113 pm |
Ionic radius (2- ion):pm | Ionic radius (1- ion):pm |
Praseodymium Conductivity
Thermal conductivity:12.5 J/m-sec-deg | Electrical conductivity:14.706 1/mohm-cm |
Praseodymium Abundance & Isotopes
Abundance earth's crust:0.9 log | |
Abundance solar system:-0.778 log | |
Cost, pure:$480 per 100g | |
Cost, bulk: $ per 100g | |
Source:
Monazite(phosphate),bastnaesite |
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Isotopes:
1 |
Praseodymium Other
Other:
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