Identify like terms: 8ab and ab, -2b and -b

-2b and -b are like terms.

8ab and ab is like and -2b and -b is alike

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.