Francium is a chemical element with the symbol "Fr" and atomic number 87. It is a highly radioactive alkali metal and is part of the alkali metal group on the periodic table, which includes elements like sodium and potassium. Francium is extremely rare in nature and is typically produced artificially in nuclear reactors. Here are some key points about francium:

Radioactivity: Francium is one of the most radioactive elements, and it has no stable isotopes. Its most stable isotope, francium-223, has a half-life of only about 22 minutes.

Occurrence: Due to its extreme rarity, francium is not found in significant quantities in the Earth's crust. It is usually created as a decay product of other radioactive elements, such as thorium and uranium.

Properties: Francium has properties similar to other alkali metals. It is silvery-white in appearance and is highly reactive with water and air. It can react vigorously with other elements.

Applications: Because of its extreme rarity and high radioactivity, francium has limited practical applications. It has primarily been used in scientific research, such as studies of atomic structure and nuclear reactions.

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