USVI NGSS Science Grade 11 Practice Questions - U.S. Virgin Islands NGSS Science Summative Assessment, Grade 11 Exam

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Which periodic trend explains why atomic radius generally decreases from left to right across a period in the periodic table?

Increasing effective nuclear charge pulls valence electrons closer to the nucleus Increasing electron shielding pushes outer electrons further away Decreasing number of protons weakens the attraction to valence electrons Increasing atomic mass expands the volume of the electron cloud

Correct Answer:

Increasing effective nuclear charge pulls valence electrons closer to the nucleus

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