A. Fluorine
B. Chlorine
C. Astatine
D. Iodine
¨ The rarest halogen among the options given is Astatine (At). Astatine is a radioactive element and is the rarest naturally occurring element in the Earth’s crust. It is a member of the halogen family and has chemical properties similar to iodine (I) and other halogens. Astatine is produced naturally by the decay of uranium and thorium, but its scarcity and radioactivity make it difficult to study and isolate in pure form.
Submitted by :- Jamil Ahmed