Here's why:
* Electron Shells: Electron shells are energy levels surrounding the nucleus of an atom. Each shell can hold a certain number of electrons.
* Atomic Number: Francium has an atomic number of 87, meaning it has 87 protons and 87 electrons.
* Filling Shells: Electrons fill the shells in a specific order, starting with the lowest energy level and moving outwards. The first shell can hold up to 2 electrons, the second up to 8, the third up to 18, and so on.
* Francium's Configuration: Francium's electronic configuration fills all the shells up to the seventh shell, which holds only 1 electron.
Therefore, Francium has the most electron shells of any element.
