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

Basic Information

Name: Radium
Symbol: Ra
Atomic Number: 88
Atomic Mass: (226.0) amu
Melting Point: 700.0 °C (973.15 K, 1292.0 °F)
Boiling Point: 1737.0 °C (2010.15 K, 3158.6 °F)
Number of Protons/Electrons: 88
Number of Neutrons: 138
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 5.0 g/cm3
Color: silverish

Atomic Structure

[Bohr Model of Radium]  
Number of Energy Levels: 7

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 18
    Sixth Energy Level: 8
    Seventh Energy Level: 2


Isotope Half Life
Ra-22238.0 seconds
Ra-22311.43 days
Ra-2243.66 days
Ra-22514.9 days
Ra-2261600.0 years
Ra-2285.76 years


Date of Discovery: 1898
Discoverer: Pierre and Marie Curie
Name Origin: From the Latin word radius (ray)
Uses: treating cancer
Obtained From: uranium ores

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MLA Format for Citing This Page

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