45. Consider the ions Li+, Na+, Be2+, and Mg2+. Which two
are closest to one another in size?
(A) Li+ and Na+
(B) Be2+ and Mg2+
(C) Be2+ and Li+
(D) Li+ and Mg2+
The Attempt at a Solution
I thought it wouldn't be A, B, or D due to the pairs having different outer electron shells. I thought C would be the correct answer since they are isoelectronic and thought that the extra proton would not make too large of a difference in radius.