Question

identify the largest and smallest species from O2-, F-, Na+, and Mg2+​

Answer 1

Answer:

Mg +2 largest and O- small

Answer 2

Make it easier by first sorting them into Periodic Table order: O2-, F-, Na+ and Mg2. These are all isoelectronic with the structure 2,8. The smallest ion will be the one with the largest number of protons – Al3+; the biggest, the one with the least protons – N3-.