Atomic size decreases across a period due to an increase in the effective nuclear charge, Zeff.

Name: Atomic size decreases across a period due to an increase in the effective nuclear charge, Zeff.
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As the atomic number increases across a period, more protons are added to the nucleus, thus increasing the effective nuclear charge. This attracts the electrons more strongly, pulling them closer to the nucleus and decreasing the atomic radius.

Atomic Size Decreases Across a Period Due to an Increase