Element: Francium (Fr)

Element (Atom) NameFrancium
SymbolFr
Physical state at room temperatureSolid
Element ClassificationMetal
Group NameAlkali Metal
Group number (Periodic table)1
Period Number (Periodic table) 7
Atomic number87
Atomic Weight223 (Ref: Jlab-ele087, Lanl-87, Nist-87)
Atomic Radius348 pm (Van der Waals) (Ref: Lanl-87)
Density?
Melting point27°C (Ref: Jlab-ele087)
30 °C (Ref: Lanl-87)
Boiling point680 °C (Ref: Lanl-87)
Electron shell configuration1s2 
2s2 2p6 
3s2 3p6 3d10 
4s2 4p6 4d10 4f14 
5s2 5p6 5d10 
6s2 6p6 
7s1
Oxidation States+1 (Ref: Jlab-ele087)
Ionization Energy3.9 eV (Ref: Jlab-ele087)
4.0727411  eV (Ref: Nist-87)
Number of Stable Isotopes0
InChI1S/Fr (Ref: Pubchem-87)
InChI KeyKLMCZVJOEAUDNE-UHFFFAOYSA-N (Ref: Pubchem-87)

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