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


Basic Information


Name: Actinium
Symbol: Ac
Atomic Number: 89
Atomic Mass: (227.0) amu
Melting Point: 1050.0 °C (1323.15 K, 1922.0 °F)
Boiling Point: 3200.0 °C (3473.15 K, 5792.0 °F)
Number of Protons/Electrons: 89
Number of Neutrons: 138
Classification: Rare Earth
Crystal Structure: Cubic
Density @ 293 K: 10.07 g/cm3
Color: Silvery


Atomic Structure

[Bohr Model of Actinium]  
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: 9
    Seventh Energy Level: 2

Isotopes

Isotope Half Life
Ac-22510.0 days
Ac-2261.2 days
Ac-22721.8 years
Ac-2286.16 hours

Facts


Date of Discovery: 1899
Discoverer: Andre Debierne
Name Origin: From the Greek word aktinos (ray)
Uses: No uses known
Obtained From: extremely rare

Related Links

I currently do not know of any links for Actinium. If you do, please let me know

MLA Format for Citing This Page


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

For more information about citing online sources, please visit the MLA's Website.

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