Answer :
Na has a atomic radius of 160 pm
Mg has a atomic radius of 140 pm
Si has a atomic radius of 114 pm
Cl has a atomic radius of 100 pm
So the answer is D) Cl
Mg has a atomic radius of 140 pm
Si has a atomic radius of 114 pm
Cl has a atomic radius of 100 pm
So the answer is D) Cl