ЦТ Chemistry Practice Questions - ЦТ ЦЭ Chemistry (Belarus Centralized Testing Centralized Exam) Exam

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How does atomic radius change across Period 3 of the Periodic Table from sodium (Na) to chlorine (Cl), and what is the primary reason?

It increases because additional electron shells are added. It remains constant because shielding by core electrons offsets nuclear charge completely. It increases because electron-electron repulsion in the valence shell expands the electron cloud. It decreases because the effective nuclear charge increases while the number of electron shells remains constant.

Correct Answer:

It decreases because the effective nuclear charge increases while the number of electron shells remains constant.

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