| Which one of the following ions has electronic configuration\[[Ar]\text{ }3{{d}^{6}}\]? |
| (At. no: Mn = 25, Fe = 26, Co = 27, Ni = 28) [AIPMT (S) 2010] |
A) \[N{{i}^{3+}}\]
B) \[M{{n}^{3+}}\]
C) \[F{{e}^{3+}}\]
D) \[C{{o}^{3+}}\]
Correct Answer: D
Solution :
| Key Idea: Write the electronic configurations of given ions and find the correct answer. |
| \[N{{i}^{3+}}(28)=[Ar]3{{d}^{7}}\] |
| \[M{{n}^{3+}}(25)=[Ar]3{{d}^{4}}\] |
| \[F{{e}^{3+}}(26)=[Ar]\,3{{d}^{5}}\] |
| \[C{{o}^{3+}}(27)=[Ar]\,3{{d}^{6}}\] |
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