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Praseodymium at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Mass: 140.90765 amu
Melting Point: 935.0 °C (1208.15 K, 1715.0 °F)
Boiling Point: 3127.0 °C (3400.15 K, 5660.6 °F)
Number of Protons/Electrons: 59
Number of Neutrons: 82
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 6.77 g/cm3
Color: Unknown

Atomic Structure

[Bohr Model of Praseodymium]  
Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 21
    Fifth Energy Level: 8
    Sixth Energy Level: 2


Isotope Half Life
Pr-14219.12 hours
Pr-14313.57 days
Pr-14417.28 minutes
Pr-1457.2 minutes


Date of Discovery: 1885
Discoverer: C.F. Aver von Welsbach
Name Origin: From the Greek words prasios (green) and didymos (twin)
Uses: coloring glass and ceramics
Obtained From: salts

Related Links

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Bentor, Yinon. Chemical Element.com - Praseodymium. <http://www.chemicalelements.com/elements/pr.html>.

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