PAU Chemistry (Cantabria) Practice Questions - Cantabria PAU Chemistry 2026 (Pruebas De Acceso A La Universidad, Universidad De Cantabria) Exam

How does the atomic radius generally change across Period 3 of the periodic table from sodium (Na) to chlorine (Cl)?

It increases because electrons are added to higher energy shells with larger principal quantum numbers. It remains constant because the added protons and electrons cancel out each other's effects completely. It decreases because the effective nuclear charge increases while inner shielding remains nearly constant. It decreases because atomic mass decreases across the period from left to right.

Correct Answer:

It decreases because the effective nuclear charge increases while inner shielding remains nearly constant.

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