Question

How does atomic radius change as we move from left to right in a period?

Answer 1

Atomic radius increases as we move from left to right, but it decreases if move from up to down

Answer 2

Atomic radius decreases from left to right with in a period this is caused by increasing number of protons and electrons across the period. One proton has greater effect than one electron. Thus electrons are pulled towards nucleus, resulting in a smaller size