Outline the main points of Dalton's atomic theory. Check all that apply. A chemical reaction involves a rearrangement of atoms. Compounds are formed when atoms of different elements combine in different proportions. Atoms of a given element are alike. All matter is composed of atoms. Atoms of a given element are different. Compounds are formed when atoms of different elements combine in fixed proportions. Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining