Fluorine (F) is a halogen, and elements in the same group (column) of the periodic table share similar properties.

Therefore, the elements with properties most similar to fluorine are the other halogens:

* Chlorine (Cl)

* Bromine (Br)

* Iodine (I)

* Astatine (At)

These elements all:

* Have 7 valence electrons

* Are highly electronegative

* Form -1 anions readily

* Are nonmetals

* Are reactive, especially with metals

However, there are also some differences due to increasing atomic size and decreasing electronegativity as you move down the group.