A classmate converts 68 km to meters and gets 0.068 m as the answer. explain why this answer is incorrect, and identify the likely source of error.

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.

the awnser is group 12