Answer:-
Increases
Explanation:-
Atomic size refers to the distance between the nucleus and the outermost valence shell.
As you move down a group, a new shell is added. So the distance of the valence shell increases from the nucleus as we go down a group.
Thus as you move down a group in the periodic table atomic size generally
Answer:
rows
Explanation: periods are ROWS that run from left to right.
It changes because when the 2 tectonic plates collide they form mountains and volcanoes.
Continental drift causes tectonic plates to either "pull apart" or "crash" into each other.
Plates that crash into each other either form mountains, or when one slides under the other (a subduction zone) volcanoes from.