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Problem: Which of the following ions or atoms will be smallest and why?S2− , Cl − , Ar, K + , Ca2+A. S2− because it has the most electronsB. S2− because it has the most protonsC. Ca2+ because it has the most electronsD. Ca2+ because it has the most protonsE. S2−  because it has the least protons

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Problem Details

Which of the following ions or atoms will be smallest and why?

S2− , Cl , Ar, K + , Ca2+

A. S2− because it has the most electrons

B. S2− because it has the most protons

C. Ca2+ because it has the most electrons

D. Ca2+ because it has the most protons

E. S2−  because it has the least protons

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