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Question

Which of the following ions has electronic configuration $$[Ar]d^{6}$$?


A
La3+(Z=57)
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B
Ti3+(Z=22)
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C
Co3+(Z=27)
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D
Sc3+(Z=21)
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Solution

The correct option is C $$Co^{3+}(Z=27)$$
Option C is correct
$$[Ar]d^6$$ means total electron is 24
$$Co$$ atomic number $$27$$
$$Co^{+3}$$ has $$27-3=24$$ electrons

Chemistry
NCERT
Standard XII

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