The law of universal gravitation states that any two objects in the universe that have mass, without exception,

a. attract each other
b. repeal each other
c. combine to provide a balanced force
d. create friction

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.