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Which of the following statements correctly describes the trend in atomic radius across Period 3 from sodium (Na) to argon (Ar)?.
- A.A) Atomic radius increases due to increased shielding.
- B.B) Atomic radius decreases due to increased nuclear charge.
- C.C) Atomic radius remains constant across the period.
- D.D) Atomic radius decreases due to decreased electron-electron repulsion.
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