Francium

Analytical testing dots

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

 

General
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
Miscellaneous
Magnetic ordering  
Electrical resistivity  3 µΩ·m
Thermal conductivity (300K)  15 W·m-1·K-1
CAS registry number 7440-73-5

 

View the Periodic Table...

View the List of Elements...

Analytical testing dots

Content from Wikipedia for educational use and displayed with permission under the GFDL.
Please report any inaccuracies to the Webmaster.