Which outcome can be expected from adding a catalyst to a chemical reaction? a. the reaction will speed up b. chemical equilibrium will not be reached c. the reaction will slow d. no change will occur

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.