francium$29864$ - definition. What is francium$29864$
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Francium-223; Francium-199; Francium-200; Francium-201; Francium-202; Francium-203; Francium-204; Francium-205; Francium-206; Francium-207; Francium-208; Francium-209; Francium-210; Francium-211; Francium-212; Francium-213; Francium-214; Francium-215; Francium-216; Francium-217; Francium-218; Francium-219; Francium-220; Francium-221; Francium-222; Francium-224; Francium-225; Francium-226; Francium-227; Francium-228; Francium-229; Francium-230; Francium-231; Francium-232; Francium isotopes; Francium isotope

Ununennium         
  • ninth period]], measured in [[angstrom]]s<ref name="Haire" /><ref name="pyykko" />
  • bibcode=2001JChPh.115.2389L }}</ref>
  • url=https://semanticscholar.org/paper/a0ec522315904230d171353561d53f24d17dcfad}}</ref>
  • 2013}}
  • access-date=27 August 2013}}</ref>
HYPOTHETICAL CHEMICAL ELEMENT WITH THE ATOMIC NUMBER 119
Element 119; Eka-Francium; Eka-francium; Isotopes of Ununennium; Eka francium; User:Double sharp/Ununennium; Ekafrancium; Ununennium-295; Ununennium-296; Ununennium-297; History of ununennium
Ununennium, also known as eka-francium or element 119, is the hypothetical chemical element with symbol Uue and atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element is discovered, confirmed, and a permanent name is decided upon.
Francium         
  • alt=A shiny gray 5-centimeter piece of matter with a rough surface.
CHEMICAL ELEMENT WITH SYMBOL FR AND ATOMIC NUMBER 87
Element 87; Virginium; Frankium; Moldavium; Actinium K; Alcalinium; Francium 223; Russium; Alkalinium; Eka-caesium; Fr (element); Catium
Francium is a chemical element with the symbol Fr and atomic number 87. It is extremely radioactive; its most stable isotope, francium-223 (originally called actinium K after the natural decay chain it appears in), has a half-life of only 22 minutes.
francium         
  • alt=A shiny gray 5-centimeter piece of matter with a rough surface.
CHEMICAL ELEMENT WITH SYMBOL FR AND ATOMIC NUMBER 87
Element 87; Virginium; Frankium; Moldavium; Actinium K; Alcalinium; Francium 223; Russium; Alkalinium; Eka-caesium; Fr (element); Catium
['frans??m]
¦ noun the chemical element of atomic number 87, an unstable radioactive member of the alkali metal group. (Symbol: Fr)
Origin
1940s: from the country France + -ium.

ويكيبيديا

Isotopes of francium

Francium (87Fr) has no stable isotopes. A standard atomic weight cannot be given. Its most stable isotope is 223Fr with a half-life of 22 minutes, occurring in trace quantities as an intermediate decay product of 235U.

Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable. All elements with atomic number of 106 (seaborgium) or greater have most-stable-known isotopes shorter than that of francium, but as those elements have only a relatively small number of isotopes discovered, the possibility remains that undiscovered isotopes of these elements may have longer half-lives.