Analytical testing dots

Francium is a metallic chemical element (symbol Fr) with an atomic number of 87.


Name, Symbol, Number francium, Fr, 87
Chemical series alkali metals
Group, Period, Block 1, 7, s
Appearance metallic
Standard atomic weight (223) g·mol-1
Electrons per shell 2, 8, 18, 32, 18, 8, 1
Physical properties
Phase  solid
Density (near r.t.) 1.87 g·cm-3
Melting point  300K
(27°C, 80°F)
Boiling point  950K
(677°C, 1250°F)
Heat of fusion ca. 2 kJ·mol-1
Heat of vaporization ca. 65 kJ·mol-1
Vapor pressure (extrapolated)
P(Pa) 1 10 100 1 k 10 k 100 k
at T(K) 404 454 519 608 738 946
Atomic properties
Crystal structure  cubic body centered
Oxidation states 1
(strongly basic oxide)
Electronegativity 0.7 (Pauling scale)
Ionization energies 1st: 380 kJ/mol
Magnetic ordering  
Electrical resistivity  3 µΩ·m
Thermal conductivity (300K)  15 W·m-1·K-1
CAS registry number 7440-73-5


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Analytical testing dots

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