Atomic size

a. decreases as you move from top to bottom within a group

b. remains constant within a period

c. decreases as you move from left to right across a period

d. increases as you move from left to right across a period

Option C, decreases as you move from left to right across a period

As you move from left to right across a period, the atoms get more and more protons. These protons pull on the electrons, making the atoms progressively smaller and smaller because of the increasing pull.

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explanation:

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