The elements chlorine and iodine have similar chemical properties because they
A) are both metals
B) are in the same chemical period
C) have the same number of electrons in their outer energy levels
D) have the same number of stable isotopes
E) none of these

Question

Quizplus · Accepted Answer

Chlorine and iodine have similar chemical properties because they are both halogens, found in Group 17 of the periodic table, meaning they have the same number of electrons in their outermost energy level, which determines their chemical behavior.

The Elements Chlorine and Iodine Have Similar Chemical Properties Because