Question

Among Na+,Li+,Cs+,Mg2+has largest ionic size

Answer 1

The answer to your question is Cs2+

Answer 2

Cs+2 is having the largest ionic size because when there is a case of comparison of ionic sizes we find e/z(e=no of electrons of ions and z=atomic number)size is directly proportional to e/z.Na+=e/z=10/11=0.90 Li+=2/3=0.67 Mg+2=10/12=0.84 Cs+=54/55=0.98 Since Cs+ having greater e/z so size is more