-Group 17 elements are called Halogens

-The elemnts in this group are:

-Flourine(F)

-Chlorine(C)

-Bromine(Br)

-Iodine(I)

Astatine(At)

-Astatine is radioactive and has short-lived isototpes, but it is still apart of the Halogens group because it behaves similar to Iodine.

-They all form acids when combined with Hydrogen.

-They are all toxic.

-They all have seven Valence elctrons in their outer shell.