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  • Francium - Wikipedia
    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
  • Francium | Radioactive, Alkali Metal, Rare | Britannica
    francium (Fr), heaviest chemical element of Group 1 (Ia) in the periodic table, the alkali metal group It exists only in short-lived radioactive forms Natural francium cannot be isolated in visible, weighable amounts, for only 24 5 grams (0 86 ounce) occur at any time in the entire crust of Earth
  • Francium - Element information, properties and uses . . .
    Francium, number 87, was the last of these elements to be discovered in nature From its position in the table, it was clear that element 87 would be a reactive alkali metal, the heaviest member of the family lithium, sodium, potassium, rubidium and caesium
  • Francium Facts, Symbol, Discovery, Properties, Uses
    Francium definition, discovery, properties (atomic mass, color, melting point, atomic number, electron configuration), reactivity in water, common uses
  • Francium: Facts about the elusive radioactive element
    Francium — the 87th element on the periodic table — is a naturally occurring, but incredibly rare, radioactive element It forms and decays extremely quickly, so it has no practical uses, and it
  • Francium | History, Uses, Facts, Physical Chemical . . .
    Francium is formed by radioactive decay of actinium, and artificially made by bombarding thorium with protons It is naturally present in uranium and consider the second rarest element in the earth crust It exists in short-lived radioactive forms and cannot be isolated in pure stable form
  • Francium Facts (Atomic Number 87 or Fr) - ThoughtCo
    Francium is a rare and highly unstable element with the atomic number 87 and symbol Fr Discovered in 1939, francium decays quickly, making it the second rarest natural element after astatine





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