Information valid for Pa-231 unless otherwise noted
[ATOM]

Protactinium

 [ATOM]

Basic Information


Symbol: Pa
Atomic Number: 91
Mass: 231.036
Melting Point: 1600
Boiling Point: Unknown
Number of Protons/Electrons: 91
Number of Neutrons: 140
Classification: Rare Earth
Crystal Structure: Orthorhombic
Density: 15.4
Color: Unknown

Atomic Structure

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

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 20
    Sixth Energy Level: 9
    Seventh Energy Level: 2

Isotopes

Isotope Half Life
Pa-23017.4 days
Pa-23132800 years
Pa-23327 days
Pa-2346.69 hours
Pa-234m1.17 minutes

Facts


Date of Discovery: 1917
Discoverer: Fredrich Soddy
Name Origin: From the Greek word protos (first)
Uses: No uses known
Obtained From: fission product of uranium, thorium, plutonium

Related Links

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