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Basic Information
Name: Francium
Symbol: Fr
Atomic Number: 87
Atomic Mass: (223.0) amu
Melting Point: 27.0 °C (300.15 °K, 80.6 °F)
Boiling Point: 677.0 °C (950.15 °K, 1250.6 °F)
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]](Chemical Elements_com - Francium (Fr)_files/b0087.gif) |
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: 8 Seventh Energy Level: 1 |
Isotopes
| Isotope | Half Life |
| Fr-212 | 20.0 minutes |
| Fr-221 | 4.8 minutes |
| Fr-222 | 14.3 minutes |
| Fr-223 | 21.8 minutes |
Facts
Date of Discovery: 1939
Discoverer: Marguerite Derey
Name Origin: After France
Uses: No uses known
Obtained From: decay of actinium