Francium

Frae Wikipedia
Lowp tae: navigation, rake
Francium,  87Fr
General properties
Name, seembol francium, Fr
Pronunciation /ˈfrænsiəm/
FRAN-see-əm
Francium in the periodic cairt
Hydrogen (diatomic nonmetal)
Helium (noble gas)
Lithium (alkali metal)
Beryllium (alkaline yird metal)
Boron (metalloid)
Carbon (polyatomic nonmetal)
Nitrogen (diatomic nonmetal)
Oxygen (diatomic nonmetal)
Fluorine (diatomic nonmetal)
Neon (noble gas)
Sodium (alkali metal)
Magnesium (alkaline yird metal)
Aluminium (post-transeetion metal)
Silicon (metalloid)
Phosphorus (polyatomic nonmetal)
Sulfur (polyatomic nonmetal)
Chlorine (diatomic nonmetal)
Argon (noble gas)
Potassium (alkali metal)
Calcium (alkaline yird metal)
Scandium (transeetion metal)
Titanium (transeetion metal)
Vanadium (transeetion metal)
Chromium (transeetion metal)
Manganese (transeetion metal)
Airn (transeetion metal)
Cobalt (transeetion metal)
Nickel (transeetion metal)
Capper (transeetion metal)
Zinc (transeetion metal)
Gallium (post-transeetion metal)
Germanium (metalloid)
Arsenic (metalloid)
Selenium (polyatomic nonmetal)
Bromine (diatomic nonmetal)
Krypton (noble gas)
Rubidium (alkali metal)
Strontium (alkaline yird metal)
Yttrium (transeetion metal)
Zirconium (transeetion metal)
Niobium (transeetion metal)
Molybdenum (transeetion metal)
Technetium (transeetion metal)
Ruthenium (transeetion metal)
Rhodium (transeetion metal)
Palladium (transeetion metal)
Siller (transeetion metal)
Cadmium (transeetion metal)
Indium (post-transeetion metal)
Tin (post-transeetion metal)
Antimony (metalloid)
Tellurium (metalloid)
Iodine (diatomic nonmetal)
Xenon (noble gas)
Caesium (alkali metal)
Barium (alkaline yird 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 (transeetion metal)
Tantalum (transeetion metal)
Tungsten (transeetion metal)
Rhenium (transeetion metal)
Osmium (transeetion metal)
Iridium (transeetion metal)
Platinum (transeetion metal)
Gold (transeetion metal)
Mercur (transeetion metal)
Thallium (post-transeetion metal)
Leid (post-transeetion metal)
Bismuth (post-transeetion metal)
Polonium (post-transeetion metal)
Astatine (metalloid)
Radon (noble gas)
Francium (alkali metal)
Radium (alkaline yird 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 (transeetion metal)
Dubnium (transeetion metal)
Seaborgium (transeetion metal)
Bohrium (transeetion metal)
Hassium (transeetion metal)
Meitnerium (unkent chemical properties)
Darmstadtium (unkent chemical properties)
Roentgenium (unkent chemical properties)
Copernicium (transeetion metal)
Ununtrium (unkent chemical properties)
Flerovium (post-transeetion metal)
Ununpentium (unkent chemical properties)
Livermorium (unkent chemical properties)
Ununseptium (unkent chemical properties)
Ununoctium (unkent chemical properties)
Cs

Fr

(Uue)
radonfranciumradium
Atomic nummer (Z) 87
Group, block group 1 (alkali metals), s-block
Period period 7
Element category   alkali metal
Staundart atomic wicht (Ar) (223)
Electron configuration [Rn] 7s1
per shell
2, 8, 18, 32, 18, 8, 1
Pheesical properties
Phase solid presumably
Meltin pynt ? 300 K ​(27 °C, ​80 °F)
Bylin pynt ? 950 K ​(677 °C, ​1250 °F)
Density near r.t. 1.87 g/cm3 (extrapolatit)
Heat o fusion ca. 2 kJ/mol
Heat o vapourisation ca. 65 kJ/mol
vapour pressur (extrapolatit)
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 ​(a strangly basic oxide)
Electronegativity Pauling scale: 0.7
Ionisation energies 1st: 393[1] kJ/mol
Covalent radius 260 pm (extrapolatit)
Van der Waals radius 348 pm (extrapolatit)
Miscellanea
Creestal structur ​body-centred cubic
[[File:body-centred cubic|50px|alt=Body-centred cubic crystal structur for francium|Body-centred cubic crystal structur for francium]]

(extrapolatit)
Thermal conductivity 15 W/(m·K) (extrapolatit)
Electrical resistivity 3 µΩ·m (calculatit)
Magnetic orderin Paramagnetic
CAS Nummer 7440-73-5
History
Namin efter Fraunce, homeland o the discoverer
Diskivery an first isolation Marguerite Perey (1939)
Maist stable isotopes o francium
iso NA hauf-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

Francium is a chemical element wi seembol Fr an atomic nummer 87.

References[eedit | eedit soorce]

  1. ISOLDE Collaboration, J. Phys. B 23, 3511 (1990) (PDF online)