Which of the following ions has an electron configuration different from the other?
-
17CI-
- 8O2-
- 12Mg2+
- 13AI3+
The correct answer is: A
Explanation
\(_{17}\)Cl\(^-\) = 18 electrons = 2, 8, 8
\(_{12}\)Mg\(^{2+}\), \(_{8}\)O\(^{2-}\) and \(_{13}\)Al\(^{3+}\) all have 10 electrons = 2, 8.