TASC Chemistry Level 4 Practice Questions - TASC Chemistry Level 4 (CHM415115) External Assessment Exam

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Across Period 3 of the Periodic Table (from Na to Ar), first ionization energy generally increases. Which statement best explains this trend?

Nuclear charge increases while shielding by inner shell electrons remains relatively constant, increasing electrostatic attraction on valence electrons. Atomic radius increases across the period, bringing outer electrons closer to the nucleus. The number of inner electron shells increases, increasing electron-electron repulsion. Electronegativity decreases across the period, making it easier to gain electrons.

Correct Answer:

Nuclear charge increases while shielding by inner shell electrons remains relatively constant, increasing electrostatic attraction on valence electrons.

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