\which describe the image formed by a plane mirror? Check all that apply. virtual real upside down right-side up larger than the object smaller than the object same size as the object

What do the atoms of elements in the same group have in common? a. they have the same atomic numbers. b. they have the same average atomic masses. c. they have the same number of electron shells. d. they have the same number of electrons in their outermost shells.