Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Chemical Sciences Chemical Periodicity

Which one of the following represents the correct order of size among O2-, F-, Na+ and Mg+2 isolectronic ions?

1
O2- < F- < Na+ < Mg+2 
2
Mg+2 < Na+ < F- < O2-
3
Mg+2- < Na+ < O2- < F-
4
O2- < F- < Mg+2 < Na+
5
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