کينډۍ:Infobox francium

Francium,  ₈₇Fr

عمومي خواص
Pronunciation	/ˈfrænsiəm/ FRAN-see-əm
Francium په دوراني جدول کې
Cs ↑ Fr ↓ (Uue) radon ← francium → radium ‍
اټومي شمیره (Z)	87
گروپ, پیریود	group 1 (alkali metals), period 7
بلاک	s-block
Element category	alkali metal
Mass number	223 (most stable isotope)
Electron configuration	[Rn] 7s1
Electrons per shell	2, 8, 18, 32, 18, 8, 1
فزیکي خواص
حالت (at STP)	جامد presumably
دويلې کيدو ټکى	? 300 K ​(30 °C, ​80 °F)
يشنا ټکی	? 950 K ​(680 °C, ​1300 °F)
Density near r.t.	2.8–3.0 g/cm3 (extrapolated)
Vapor pressure (extrapolated) P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 404 454 519 608 738 946
اټومي خواص
Oxidation states	+1 ​(a strongly basic oxide)
Electronegativity	Pauling scale: >0.79
Ionization energies	1st: 393 kJ/mol
Covalent radius	260 pm (extrapolated)
Van der Waals radius	348 pm (extrapolated)
Miscellanea
Crystal structure	​body-centered cubic (bcc) Body-centered cubic crystal structure for francium (extrapolated)
د تودوخې تېرېدنه	15 W/(m·K) (extrapolated)
Electrical resistivity	3 µΩ·m (calculated)
Magnetic ordering	Paramagnetic
CAS Number	7440-73-5
History
Naming	after France, homeland of the discoverer
Discovery and first isolation	Marguerite Perey (1939)
Main isotopes of francium
آيسو­ټوپ Abun­dance نیم ژوند (t1/2) Decay mode Pro­duct 221Fr trace 4.8 min α 217At 222Fr syn 14.2 min β− 222Ra

Element navigation

PTfranciumPT

Rn ←

iso 87Fr ibox    wd:Q671

→ Ra

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