CAST High School Practice Questions - California Science Test (CAST) - High School Exam

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Moving left to right across a period on the periodic table, atomic radius generally decreases. What best explains this trend?

Atoms gain more electron shells, so radius increases Nuclear charge increases while electrons occupy the same principal shell, pulling the electron cloud closer Atoms lose protons, so attraction to electrons weakens Electrons become less tightly held because ionization energy always decreases

Correct Answer:

Nuclear charge increases while electrons occupy the same principal shell, pulling the electron cloud closer

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