ଛାଞ୍ଚ:Infobox Francium

Francium,  ₈₇Fr

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	francium, Fr
Appearance	Unknown, but probably metallic
ଉଚ୍ଚାରଣ	/ˈfrænsiəm/ FRAN-see-əm
Francium in the periodic table
Cs ↑ Fr ↓ Uue radon ← francium → radium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	87
ଶ୍ରେଣୀ, ବ୍ଳକ	group 1 (alkali metals), s-block
ପର୍ଯ୍ୟାୟ	period 7
ମୌଳିକ ପ୍ରକାର	alkali metal
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	(223)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Rn] 7s1
per shell	2, 8, 18, 32, 18, 8, 1
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid presumably
ଗଳନାଙ୍କ	? 300 K ​(? 27 °C, ​? 80 °F)
ସ୍ଫୁଟନାଙ୍କ	? 950 K ​(? 677 °C, ​? 1250 °F)
Density near r.t.	? 1.87 (extrapolated) g/cm3
Heat of fusion	ca. 2 kJ/mol
Heat of	ca. 65 kJ/mol
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	Pauling scale: 0.7
Covalent radius	260 (extrapolated) pm
Van der Waals radius	348 (extrapolated) pm
Miscellanea
Crystal structure	​cubic body-centered (extrapolated) Cubic body-centered (extrapolated) crystal structure for francium
Thermal conductivity	15 (extrapolated) W/(m·K)
Electrical resistivity	3 µ (calculated) Ω·m
Magnetic ordering	Paramagnetic
CAS Number	7440-73-5
ଇତିହାସ
ଆବିଷ୍କାର	Marguerite Perey (1939)
First isolation	Marguerite Perey (1939)
Most stable 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

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