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Chemistry 9 Online
OpenStudy (anonymous):

Which of the following ions have the same ground state electron configuration: Sr2+, Ca2+, Mg2+, and S2-? Ca2+ and S2- Mg2+ and S2- Ca2+ and Mg2+ Sr2+ and Ca2+ None of the Above

OpenStudy (wolfe8):

Welcome to OpenStudy. Can you get the electron configuration or at least the number of electrons of those? Use: http://www.ptable.com/

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