Sr+2 is diamagnetic. The atomic number of Sr is 38.So we can write its Electronic configuration (E.C.) as : Sr = [Kr]5s2
Now,when we have Sr+2 ion that means the new E.C. becomes Sr+2 = [Kr] 5s0 Since Kr is noble gas hence there will be no unpaired electron and that’s why Sr+2 is diamagnetic.
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