Francium,  ₈₇ Fr

Francium
Pipe	/ ? f r æ n s i ? m / ​ ( FRAN -see-?m )
Ihansoju	metallic
n??mba isuj?	[223]
Francium ni ori tabili aye
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 Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Cs ↑ Fr ↓ Uue radon ← francium → radium
N??mba at??mu ( Z )	87
?gb??	group 1 : H and alkali metals
Aye	aye 7
Adip??	Adip??-s
??ka ??lim??nti	Alkali metal
Ito ??l??ktr??nu	[ Rn ] 7s 1
Iye ??l??ktr??nu lori ipele k????kan	2, 8, 18, 32, 18, 8, 1
Aw?n ohun ini ara
Ifarahan at  STP	solid
Igba iy??	? 300  K ​(? 27 °C, ​? 80 °F)
Igba iho	? 950 K ​(? 677 °C, ​? 1250 °F)
Kiki (near  r.t. )	1.87 g/cm 3
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 Adak?:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 0.7
Covalent radius	260  pm
Van der Waals radius	348  pm
Other properties
Natural occurrence	from decay
Crystal structure	​(bcc)
Thermal conductivity	15 W/(m·K)
Electrical resistivity	3 μ Ω·m
Magnetic ordering	Paramagnetic
CAS Number	7440-73-5
Main isotopes of francium
Iso­tope Abun­dance Half-life ( t 1/2 ) Decay mode Pro­duct 221 Fr syn 4.8 min α 6.457 217 At 222 Fr syn 14.2 min β ? 2.033 222 Ra 223 Fr trace 22.00 min β ? 1.149 223 Ra α 5.430 219 At
Adak?:Category-inline wo ??r?? atun?e | references

Fransi??m tabi Francium , mimo tele bi eka - caesium ati actinium K , ^{[akiyesi 1]} je apilese kemika to ni ami-idamo Fr ati nomba atomu 87. O ni ikan ninu awon odionina tokerejulo larin gbogbo awon apilese ti a mo, bakanna ohun ni apilese aladanida keji tosowonjulo (leyin astatine ). Fransiom je onide to je radioalagbara giga to n jera si astatine, radium , ati radon . Gege bi onide alkali , o ni agbara elektroni kan.

Francium je wiwari latowo Marguerite Perey ni Fransi (nibi ti apilese yi ti ri oruko) ni 1939. Ohun ni apilese togbeyin ti o je wiwari ninu adanida , kanran jije sisopapo. ^{[akiyesi 2]} Lode yara ise-idanwo, francium sowon gidigidi, iye ipase je wiwari ninu alumoni aladalu uranium ati thorium , nibi ti isotopu francium-223 ti n je didasile to si n je jijera bibaun. Iye to kere bi 20?30 g (ounce kan) lowa nigba yiowu kakiri inu igbele Aye ; awon isotopu yioku je alasopapo yanyan. Iye titobijulo ti o je kikojo lai isotopu yiowu ni isupo bi awon atomu 10,000 (ti francium-210) ti won je didasaye gege bi efuufu tutugidi ni Stony Brook ni 1997. ^[1]

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Awon akiyesile [ atun?e | atun?e ami??r?? ]

1. ↑ Actually the least unstable isotope, francium-223
2. ↑ Awon apilese alasopapo, bi technetium , ti je wiwari ninu adanida.

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