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 …

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 …

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 …

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 …

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 …

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 …

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 …

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 …

Discovered in 1939 by Mlle. Marguerite Perey of the Curie Institute, Paris. Francium, the heaviest known member of the alkali metals series, occurs as a result of an alpha disintegration of …

Francium, the heaviest known member of the alkali metals series, occurs as a result of an alpha disintegration of actinium. It can also be made artificially by bombarding thorium with protons. …