Problem: The atomic radius of main-group elements generally decreases from left to right across a row (or period), because the __________.        A. effective nuclear charge decreasesB. principal quantum number of the valence orbitals increasesC. number of core electrons increasesD. effective nuclear charge increasesE. principal quantum number of the valence orbitals decreases

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The atomic radius of main-group elements generally decreases from left to right across a row (or period), because the __________.        

A. effective nuclear charge decreases

B. principal quantum number of the valence orbitals increases

C. number of core electrons increases

D. effective nuclear charge increases

E. principal quantum number of the valence orbitals decreases

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