Which element has atomic number 87?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. Francium.
Francium, identified by the symbol Fr and atomic number 87, is a chemical element. It exhibits extreme radioactivity; its most stable isotope, francium-223 (initially referred to as actinium K due to its presence in the natural decay chain), has a brief half-life of merely 22 minutes. Ranked as the second-most electropositive element after cesium, francium stands as the second rarest naturally occurring element, following astatine. Its isotopes undergo rapid decay into astatine, radium, and radon. Classified as an alkali metal, francium holds its place in the periodic table.