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)the atomic radius of main-group elements generally increases down a group because a. effective nuclear charge increases down a group b. effective nuclear charge decreases down a group c. effective nuclear charge zigzags down a group d. the principal quantum number of the valence orbitals increases e. both effective nuclear charge increases down a group and the principal quantum number of the valence orbitals increases
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)the atomic radius of main-group elements generally increases down a group because a. effective nuc...
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