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 …

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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 …

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 …

Francium definition, discovery, properties (atomic mass, color, melting point, atomic number, electron configuration), reactivity in water, common uses

Francium is a heavy, unstable, radioactive metal with a maximum half-life of only 22 minutes. It has a low melting point (27 o C, 81 o F) and, if enough of it could be accumulated, it would be liquid in a …

Jul 26, 2022 · 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 …

Jun 9, 2025 · 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.

Francium is an alkali metal whose chemical properties mostly resemble those of caesium. Francium has slightly higher ionization energy than caesium, also it should have higher electron affinity than caesium.

Chemical element, Francium, information from authoritative sources. Look up properties, history, uses, and more.