Why are rules important to scientists

Without Rules there can be many mistakes in experiments, or something could go wrong (obviously) Rules to a scientists are just there for safety most of the time, or so that everything goes smoothly

To share their results so that their work can be reviewed by other scientists.

Explanation:

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.