Information valid for Cs-133 unless otherwise noted
[ATOM]

Cesium

 [ATOM]

Basic Information


Symbol: Cs
Atomic Number: 55
Mass: 132.905
Melting Point: 28.5
Boiling Point: 678.4
Number of Protons/Electrons: 55
Number of Neutrons: 78
Classification: Alkali Metal
Crystal Structure: Cubic
Density: 1.873
Color: silver
British Spelling: Caesium
IUPAC Spelling: Caesium

Atomic Structure

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

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 18
    Fifth Energy Level: 8
    Sixth Energy Level: 1

Isotopes

Isotope Half Life
Cs-1261.6 minutes
Cs-1291.3 days
Cs-1319.7 days
Cs-1326.4 days
Cs-133Stable
Cs-1342.1 years
Cs-134m2.9 hours
Cs-1352.3e+006 years
Cs-13613.2 days
Cs-13730.2 years
Cs-13832.2 minutes
Cs-1399.3 minutes

Facts


Date of Discovery: 1860
Discoverer: Fustov Kirchoff
Name Origin: From the Latin word caesius (sky blue)
Uses: removes air traces in vacuum tubes
Obtained From: pollucite, lepidolite

Related Links

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