Problem: The atomic radius of main-group elements generally increases down a column because __________.A. effective nuclear charge decreases down a columnB. the mass of an atom increases down a columnC. the highest principal quantum number of the valence orbitals increasesD. effective nuclear charge increases down a columnE. both effective nuclear charge increases down a column and the principal quantum number of the valence orbitals increases

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Problem Details

The atomic radius of main-group elements generally increases down a column because __________.

A. effective nuclear charge decreases down a column

B. the mass of an atom increases down a column

C. the highest principal quantum number of the valence orbitals increases

D. effective nuclear charge increases down a column

E. both effective nuclear charge increases down a column and the principal quantum number of the valence orbitals increases

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