DAT Destroyer gen chem question

[dasubline]

hey guys i was confused on why this statement is false, it is from Destroyer gen. chem #203. It is a question asking which one is false and this is the answer but I cannot figure out why???

"The strontium cation is larger than the sulfur anion since negative ions gain electrons"

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[PooyaH]

That statement is refering to the atomic radius of the atoms. When Sr lose 2 electrons (its ionic form) it has 2 protons more than electrons so it's going to hold on to the remaining electrons a lot tighter, thus making its radius smaller. S on the other hand has gained electrons and its radius has gotten larger. Overall, know that anions make larger radius than cations.

 

[dasubline]

got-ya, thanks!!