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Francium is a chemical element; it has 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 in which it appears), has a half-life of only 22 minutes.
Ununennium, also known as eka-francium or element 119, is a hypothetical chemical element; it has symbol Uue and atomic number 119. Ununennium and Uue are the temporary systematic IUPAC name and symbol respectively, which are used until the element has been discovered, confirmed, and a permanent name is decided upon.
Element symbols for chemical elements, also known as atomic symbols, ... Proposed name for francium. The symbol Cm is now used for curium. [nb 3] Cn: Carolinium: 90:
This list of chemical elements named after places includes elements named both directly and indirectly for places. 41 of ... Element Symbol Z ... Francium: Fr: 87:
The next element below francium (eka-francium) in the periodic table would be ununennium (Uue), element 119. [36]: 1729–1730 The synthesis of ununennium was first attempted in 1985 by bombarding a target of einsteinium-254 with calcium-48 ions at the superHILAC accelerator at the Lawrence Berkeley National Laboratory in Berkeley, California.
While the symbol is often a contraction of the element's name, it may sometimes not match the element's English name; for example, "Pb" for lead (from Latin plumbum) or "W" for tungsten (from German Wolfram). Elements which have only temporary systematic names are given temporary three-letter symbols (e.g. Uue for ununennium, the undiscovered ...
Of elements whose most stable isotopes have been identified with certainty, francium is the most unstable. All elements with atomic number of 106 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 ...
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).