Which of the following shows the halogens in order of increasing activity?
A) fluorine, bromine, chlorine, iodine
B) bromine, chlorine, iodine, fluorine
C) iodine, bromine, chlorine, fluorine
D) fluorine, chlorine, bromine, iodine
Answer: The tendency of the halogen elements to form salt like (i.e., highly ionic) compounds increases in the following order: astatine < iodine < bromine < chlorine < fluorine. ... The oxidizing strength of the halogens increases in the same order—i.e., from astatine to fluorine.
