మూస:ఫ్రాన్షియం మూలకము

ఫ్రాన్షియం, ₀₀Fr

ఫ్రాన్షియం
Pronunciation	/ˈfrænsiəm/ ​(FRAN-see-əm)
Mass number	[223]
ఫ్రాన్షియం in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Cs ↑ Fr ↓ Uue రేడాన్ ← ఫ్రాన్షియం → రేడియం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 7
Block	s-block
Electron configuration	[Rn] 7s1
Electrons per shell	2, 8, 18, 32, 18, 8, 1
Physical properties
Phase at STP	solid presumably
Melting point	? 300 K ​(? 27 °C, ​? 80 °F)
Boiling point	? 950 K ​(? 677 °C, ​? 1250 °F)
Density (near r.t.)	? 1.87 (extrapolated) g/cm3
Heat of fusion	ca. 2 kJ/mol
Heat of vaporization	ca. 65 kJ/mol
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 (expected to have a strongly basic oxide)
Electronegativity	Pauling scale: 0.7
Covalent radius	260 (extrapolated) pm
Van der Waals radius	348 (extrapolated) pm
Other properties
Natural occurrence	from decay
Crystal structure	​body-centered cubic (bcc) (extrapolated)
Thermal conductivity	15 (extrapolated) W/(m⋅K)
Electrical resistivity	3 µ (calculated) Ω⋅m
Magnetic ordering	Paramagnetic
CAS Number	7440-73-5
History
Naming	after France, homeland of the discoverer
Discovery	Marguerite Perey (1939)
First isolation	Marguerite Perey (1939)
Isotopes of ఫ్రాన్షియం

References

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