Information valid for Ac-227 unless otherwise noted
[ATOM]

Actinium

 [ATOM]

Basic Information


Symbol: Ac
Atomic Number: 89
Mass: (227)
Melting Point: 1050
Boiling Point: 3200
Number of Protons/Electrons: 89
Number of Neutrons: 138
Classification: Rare Earth
Crystal Structure: Cubic
Density: 10.07
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 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

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