SymbolFr
Latin nameFrancium
Atomic number87
Period7
Element categoryAlkali metals
Relative atomic mass223.019
GroupI.A
Electronegativity
0.7
Oxidation numbers
1
Electron configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 7s1
State
Solid
Melting point [°C]
27
Boiling point [°C]
677
Thermal conductivity [W m-1K-1]
15
Discovery
1939
Stable isotopes
0
Unstable isotopes
21