Extremadura PAU Chemistry Practice Questions - Extremadura PAU Chemistry Exam - Química 2o Bachillerato UEx 2026 Exam

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Which of the following general trends correctly describes the first ionization energy across Period 3 elements from sodium to argon?

It decreases systematically because atomic radius increases. It remains constant because electrons fill the same principal quantum shell (n = 3). It increases overall due to increasing effective nuclear charge Z*. It reaches a minimum at argon due to electron shielding.

Correct Answer:

It increases overall due to increasing effective nuclear charge Z*.

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