Problem: The radii of the ions in this series decrease because a) the elements are in the same period. b) the effective nuclear charge is increasing. c) the atomic radius of Na decreases  from Na to Al. d) the first ionization energies increase from Na to Al.

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Problem Details

The radii of the ions in this series decrease because

a) the elements are in the same period.

b) the effective nuclear charge is increasing.

c) the atomic radius of Na decreases  from Na to Al.

d) the first ionization energies increase from Na to Al.

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Based on our data, we think this problem is relevant for Professor Chang's class at VCU.