Problem: Which of the following species is isoelectronic with S  2–? 1. Rb+ 2. Br – 3. Ar 4. As 3– 5. Mg 2+

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Which of the following species is isoelectronic with S  2–?

1. Rb+

2. Br 

3. Ar

4. As 3–

5. Mg 2+

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