Francium

Francium is a highly rare and unstable chemical element found at the bottom of the periodic table’s alkali metal group. It’s extremely radioactive, meaning it decays quickly into other elements, and is one of the least common elements in nature. Due to its scarcity and the difficulty in studying it, much about francium remains unknown. It’s soft, reacts readily with water and air like other alkali metals, but because of its instability, it’s primarily of scientific interest rather than practical use. Francium exists only in tiny amounts created artificially in laboratories.