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Information valid for Fr-223 unless otherwise noted

Basic Information

Symbol: Fr
Atomic Number: 87
Mass: (223.0)
Melting Point: 27.0 C
Boiling Point: 677.0 C
Number of Protons/Electrons: 87
Number of Neutrons: 136
Classification: Alkali Metal
Crystal Structure: Cubic
Density @ 293 K: Unknown
Color: Unknown

Atomic Structure

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

  1. 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: 1


Isotope Half Life
Fr-212 20.0 minutes
Fr-221 4.8 minutes
Fr-222 14.3 minutes
Fr-223 21.8 minutes


Date of Discovery: 1939
Discoverer: Marguerite Derey
Name Origin: After France
Uses: No uses known
Obtained From: decay of actinium