Answer:
Each element is given its own chemical symbol, like H for hydrogen or O for oxygen. Chemical symbols are usually one or two letters long. Every chemical symbol starts with a capital letter, with the second letter written in lower case. For example, Mg is the correct symbol for magnesium, but mg, mG and MG are wrong.
francium
Explanation:
Fr (francium) has the lowest ionization energy. its radius is large and there is only in one electron in last energy level.
