Which of the following groups has the species listed correctly in order of increasing radius?

Question

1. Mg +2, Ca +2, Ba +2
2. Fe, Fe +2, Fe +3
3. Na, Mg, Al
4. Br-, Cl-, F-
5. K+, Na+, Li+

Is it 1. Mg +2, Ca +2, Ba +2 ?

Answer 1

yes