NCEA L3 Chemistry Practice Questions - NCEA Level 3 Chemistry (New Zealand, Year 13) Exam

Which statement correctly describes the trend in atomic radius across Period 3 from sodium (Na) to chlorine (Cl)?

Atomic radius increases because additional electron shells are added. Atomic radius decreases because nuclear charge increases while shielding remains relatively constant. Atomic radius remains constant because electrons are added to the same energy level. Atomic radius decreases because shielding increases dramatically across the period.

Correct Answer:

Atomic radius decreases because nuclear charge increases while shielding remains relatively constant.

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