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Francium Facts

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Francium
87Fr
Appearance
Unknown, but probably metallic
General properties
Name, symbol, number francium, Fr, 87
Pronunciation /ˈfrænsiəm/
fran-see-əm
Metallic category alkali metal
Group, period,block 1, 7, s
Standard atomic weight (223)
Electron configuration [Rn] 7s1
2, 8, 18, 32, 18, 8, 1
Electron shells of francium (2, 8, 18, 32, 18, 8, 1)
History
Discovery Marguerite Perey (1939)
First isolation Marguerite Perey (1939)
Physical properties
Phase solid presumably
Density (nearr.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
Miscellanea
Crystal structure cubic body-centered(extrapolated)
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
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

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