Francium, with the chemical symbol Fr and atomic number 87, is an extremely rare and highly radioactive element. It was first discovered in 1939 by the French physicist Marguerite Perey. Perey was working at the Curie Institute at the time and found Francium as a decay product of actinium. The discovery was particularly significant as it marked the last naturally occurring element to be found.

Francium is extremely rare on Earth, primarily due to its short-lived radioactive nature. It is produced through the radioactive decay of uranium and thorium. Due to its rarity and low occurrence, it has no practical applications.

The half-lives of the key Francium isotopes are extremely short. Francium-223, the most stable isotope, has a half-life of about 22 minutes.

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