Describe the trend for atomic radius from left to right across a period. Use atomic structure (e. g. energy levels, nuclear charge, attraction) to help support your answer.

As you move across a period, the atomic radii decreases. ... As you move across a period, electrons are added to the same energy level while protons are also being added. The concentration of more protons creates a higher effective nuclear charge.

pie chart because it is in percents ( % )