Which of these accurately describe the products of a reaction a. substances that are used in a reaction b. new substances that are present at the end of a reaction c. substances that do not participate in a reaction d. substances that we’re not used up in a reaction

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.