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Periodic Table of Elements

Element Praseodymium – Pr

Comprehensive data on the chemical element Praseodymium is provided on this page; including scores of properties, element names in many languages, most known nuclides of Praseodymium. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one studies. Using the "Periodic Table of Elements Quick Navigation" graphic at the bottom of the sidebar menu, one can quickly jump from chemical element to chemical element.

Praseodymium Menu

• Praseodymium Page One
  • Overview of Praseodymium
  • Praseodymium's Name in Other Languages
  • Atomic Structure of Praseodymium
  • Chemical Properties of Praseodymium
  • Physical Properties of Praseodymium
  • Regulatory / Health
  • Who/When/Where/How
• Praseodymium Page Two
  • Nuclides / Isotopes
  • Potential Parent Nuclides

Overview of Praseodymium

Praseodymium's Name in Other Languages

• Latin: Praseodymium
• Czech: Praseodym
• Croatian: Praseodimij
• French: Praséodyme
• German: Praseodym - r
• Italian: Praseodimio
• Norwegian: Praseodym
• Portuguese: Praséodimio
• Russian:
• Spanish: Prosedímio
• Swedish: Praseodym

Atomic Structure of Praseodymium

• Atomic Radius: 2.67Å
• Atomic Volume: 20.8cm³/mol
• Covalent Radius: 1.65Å
• Cross Section (Thermal Neutron Capture) _a/barns: 11.5 ±0.5
• Crystal Structure: Hexagonal

  

• Electron Configuration:

  1s² 2s²p⁶ 3s²p⁶d¹⁰ 4s²p⁶d¹⁰f³ 5s²p⁶ 6s²

• Electrons per Energy Level: 2,8,18,21,8,2

  Shell Model
  

• Ionic Radius: 1.013Å
• Filling Orbital: 4f³
• Number of Electrons (with no charge): 59
• Number of Neutrons (most common/stable nuclide): 82
• Number of Protons: 59
• Oxidation States: 3,4
• Valence Electrons: 4f³ 6s²

  Electron Dot Model
  

Chemical Properties of Praseodymium

• Electrochemical Equivalent: 1.7524g/amp-hr
• Electron Work Function: 2.7eV
• Electronegativity: 1.13 (Pauling); 1.07 (Allrod Rochow)
• Heat of Fusion: 6.89kJ/mol
• Incompatibilities:

• Ionization Potential
  • First: 5.46
  • Second: 10.551
  • Third: 21.62
• Valence Electron Potential (-eV): 42.64

Physical Properties of Praseodymium

• Atomic Mass Average: 140.9077
• Boiling Point: 3785K 3512°C 6354°F
• Coefficient of lineal thermal expansion/K^-1: 6.79E^-6
• Conductivity

  Electrical: 0.0148 10⁶/cm
  Thermal: 0.125 W/cmK

• Density: 6.77g/cc @ 300K
• Description:

  A malleable and soft rare earth metal that reacts slowly with oxygen and reacts rapidly with water.

• Elastic Modulus:
  • Bulk: 28.8/GPa
  • Rigidity: 14.8/GPa
  • Youngs: 37.3/GPa
• Enthalpy of Atomization: 368 kJ/mole @ 25°C
• Enthalpy of Fusion: 6.89 kJ/mole
• Enthalpy of Vaporization: 296.8 kJ/mole
• Flammablity Class:
• Freezing Point: see melting point
• Hardness Scale
  • Brinell: 481 MN m^-2
  • Vickers: 400 MN m^-2
• Heat of Vaporization: 296.8kJ/mol
• Melting Point: 1204K 931°C 1708°F
  
• Molar Volume: 20.8 cm³/mole
• Physical State (at 20°C & 1atm): Solid
• Specific Heat: 0.19J/gK

Regulatory / Health

• CAS Number
  • 7440-10-0
• OSHA Permissible Exposure Limit (PEL)
  • No limits set by OSHA
• OSHA PEL Vacated 1989
  • No limits set by OSHA
• NIOSH Recommended Exposure Limit (REL)
  • No limits set by NIOSH
• Levels In Humans:
  Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
  • Blood/mg dm^-3: n/a
  • Bone/p.p.m: n/a
  • Liver/p.p.m: n/a
  • Muscle/p.p.m: n/a
  • Daily Dietary Intake: n/a
  • Total Mass In Avg. 70kg human: n/a
• Discovery Year: 1885
• Name Origin:

  Greek: prasios (green) and didymos (twin); from its green salts.

• Abundance of Praseodymium:
  • Earth's Crust/p.p.m.: 9.5
  • Seawater/p.p.m.:
    • Atlantic Suface: 0.0000004
    • Atlantic Deep: 0.0000007
    • Pacific Surface: 4.4E-07
    • Pacific Deep: 0.000001
  • Atmosphere/p.p.m.: N/A
  • Sun (Relative to H=1E¹²): 4.6
• Sources of Praseodymium:

  Obtained from monazite and bastnasite ores. Annual world production is around 2400 tons. Primary mining areas are USA, Brazil, India, Sri Lanka and Australia.

• Uses of Praseodymium:

  Used for coloring glass and ceramic glazes. Also used with neodymium to make lenses for glass maker's goggles because they filter out the yellow light present in glass blowing.

• Additional Notes:

[Last update: 2/22/2007]

Praseodymium Menu

• Praseodymium Page One
  • Overview of Praseodymium
  • Praseodymium's Name in Other Languages
  • Atomic Structure of Praseodymium
  • Chemical Properties of Praseodymium
  • Physical Properties of Praseodymium
  • Regulatory / Health
  • Who/When/Where/How
• Praseodymium Page Two
  • Nuclides / Isotopes
  • Potential Parent Nuclides

Related Resources

• Anatomy of the Atom
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• Molar Mass Calculations and Javascript Calculator
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• Chemical Database
  This database focuses on the most common chemical compounds used in the home and industry.

Citing this page

If you need to cite this page, you can copy this text:

Kenneth Barbalace. Periodic Table of Elements - Praseodymium – Pr. EnvironmentalChemistry.com. 1995 - 2009. Accessed on-line: 7/4/2009
http://EnvironmentalChemistry.com/yogi/periodic/Pr.html
.