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As you move across the periods from left to right on the Periodic Table, the atomic radius decreases. Why?
a.The valence electrons are located further away from the nucleus so they experience less effective nuclear charge.
b.The effective nuclear charge increases and pulls the valence electrons closer to the nucleus.
c.The valence electrons are found in higher energy levels.

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CJmad8
answer is C. the top LEFT side Is the smallest w/ most energy. The bottom RIGHT is the biggest in size but with lower energy levels.