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

Basic Information

Name: Promethium
Symbol: Pm
Atomic Number: 61
Atomic Mass: (145.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 61
Number of Neutrons: 84
Classification: Rare Earth
Crystal Structure: Hexagonal
Density @ 293 K: 6.475 g/cm3
Color: Unknown

Atomic Structure

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

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 23
    Fifth Energy Level: 8
    Sixth Energy Level: 2


Isotope Half Life
Pm-143265.0 years
Pm-144360.0 years
Pm-14517.7 years
Pm-1465.53 years
Pm-1472.62 years
Pm-1485.37 days
Pm-148m41.3 days
Pm-1492.21 days
Pm-1511.18 days


Date of Discovery: 1945
Discoverer: J.A. Marinsky
Name Origin: From the god Prometheus (who stole fire of the sky and gave it to man)
Uses: No uses known
Obtained From: fission products of uranium, thorium, plutonium

Related Links

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MLA Format for Citing This Page

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

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