General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Francium Symbol Fr
atomic number 87 Atomic weight (223)
Density @ 293 K ? Atomic volume ?
Group Alkali Met. discovered 1939


state (s, l, g) s
melting point 300.2 K boiling point K
Heat of fusion ? Heat of vaporization ?
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1st ionization energy 384 kJ/mole electronegativity 0.7
2nd ionization energy kJ/mole electron affinity kJ/mole
3rd ionization energy kJ/mole Specific heat ?
heat atomization 73 kJ/mole atoms

Oxidation & Electrons

Shells 2,8,18,32,18,8,1 electron configuration [Rn] 7s1
minimum oxidation number 0 maximum oxidation number 1
min. common oxidation no. 0 max. common oxidation no. 1
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Appearance & Characteristics

structure color
uses toxicity
hardness mohs characteristics Radioactive


reaction with air reaction with 6M HCl vigorous, = H2, FrCl
reaction with 6M HCl vigorous, = H2, FrCl reaction with 15M HNO3
reaction with 6M NaOH vigorous, = H2, FrOH
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Other Forms

number of isotopes 1 hydride(s)
oxide(s) chloride(s)


ionic radius (2- ion) pm ionic radius (1- ion) pm
atomic radius pm ionic radius (1+ ion) 194 pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity J/m-sec-deg electrical conductivity 1/mohm-cm
polarizability 48.7 A^3


source Synthetic(U-235 decay) rel. abund. solar system log
abundance earth's crust log cost, pure $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.