Castilla Y León PAU Chemistry Practice Questions - Castilla Y León PAU Chemistry (Química 2o Bachillerato) Exam

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How does the first ionization energy generally change across Period 3 of the periodic table from Sodium (Na) to Argon (Ar)?

It decreases continuously because atomic mass increases. It increases generally due to increasing effective nuclear charge. It remains constant because electrons are added to the same principal shell. It fluctuates unpredictably with no observable trend.

Correct Answer:

It increases generally due to increasing effective nuclear charge.

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