Template:Infobox francium

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Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline earth metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline earth metal)
Aluminium (other metals)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline earth metal)
Scandium (transition metal)
Titanium (transition metal)
Vanadium (transition metal)
Chromium (transition metal)
Manganese (transition metal)
Iron (transition metal)
Cobalt (transition metal)
Nickel (transition metal)
Copper (transition metal)
Zinc (transition metal)
Gallium (other metals)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline earth metal)
Yttrium (transition metal)
Zirconium (transition metal)
Niobium (transition metal)
Molybdenum (transition metal)
Technetium (transition metal)
Ruthenium (transition metal)
Rhodium (transition metal)
Palladium (transition metal)
Silver (transition metal)
Cadmium (transition metal)
Indium (other metals)
Tin (other metals)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline earth metal)
Lanthanum (lanthanide)
Cerium (lanthanide)
Praseodymium (lanthanide)
Neodymium (lanthanide)
Promethium (lanthanide)
Samarium (lanthanide)
Europium (lanthanide)
Gadolinium (lanthanide)
Terbium (lanthanide)
Dysprosium (lanthanide)
Holmium (lanthanide)
Erbium (lanthanide)
Thulium (lanthanide)
Ytterbium (lanthanide)
Lutetium (lanthanide)
Hafnium (transition metal)
Tantalum (transition metal)
Tungsten (transition metal)
Rhenium (transition metal)
Osmium (transition metal)
Iridium (transition metal)
Platinum (transition metal)
Gold (transition metal)
Mercury (transition metal)
Thallium (other metals)
Lead (other metals)
Bismuth (other metals)
Polonium (other metals)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline earth metal)
Actinium (actinide)
Thorium (actinide)
Protactinium (actinide)
Uranium (actinide)
Neptunium (actinide)
Plutonium (actinide)
Americium (actinide)
Curium (actinide)
Berkelium (actinide)
Californium (actinide)
Einsteinium (actinide)
Fermium (actinide)
Mendelevium (actinide)
Nobelium (actinide)
Lawrencium (actinide)
Rutherfordium (transition metal)
Dubnium (transition metal)
Seaborgium (transition metal)
Bohrium (transition metal)
Hassium (transition metal)
Meitnerium (unknown chemical properties)
Darmstadtium (unknown chemical properties)
Roentgenium (unknown chemical properties)
Copernicium (transition metal)
Ununtrium (unknown chemical properties)
Flerovium (unknown chemical properties)
Ununpentium (unknown chemical properties)
Livermorium (unknown chemical properties)
Ununseptium (unknown chemical properties)
Ununoctium (unknown chemical properties)


Francium in the periodic table
General properties
Name, symbol, number francium, Fr, 87
Pronunciation /ˈfrænsiəm/
Element category alkali metal
Group, period, block 1 (alkali metals), 7, s
Standard atomic weight (223)
Electron configuration [Rn] 7s1
2, 8, 18, 32, 18, 8, 1
Physical properties
Phase solid presumably
Density (near r.t.)  ? 1.87 (extrapolated) g·cm−3
Melting point  ? 300 K, ? 27 °C, ? 80 °F
Boiling point  ? 950 K, ? 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
Oxidation states 1 (strongly basic oxide)
Electronegativity 0.7 (Pauling scale)
Ionization energies 1st: 380 kJ·mol−1
Covalent radius 260 (extrapolated) pm
Van der Waals radius 348 (extrapolated) pm
Crystal structure body-centered cubic (extrapolated)
Francium has a body-centered cubic crystal structure
Magnetic ordering Paramagnetic
Electrical resistivity 3 µ (calculated)Ω·m
Thermal conductivity 15 (extrapolated) W·m−1·K−1
CAS registry number 7440-73-5
Naming after France, homeland of the discoverer
Discovery Marguerite Perey (1939)
First isolation Marguerite Perey (1939)
Most stable isotopes
Main article: Isotopes of francium
iso NA half-life DM DE (MeV) DP
221Fr trace 4.8 min α 6.457 217At
222Fr syn 14.2 min β 2.033 222Ra
223Fr trace 22.00 min β 1.149 223Ra
α 5.430 219At
· references