Question
Fe2+ आयन का इलेक्ट्रॉनिक विन्यास लिखिए।

Answer

$\begin{array}{r}{ }_{26} \mathrm{Fe}=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^6 4 s^2\end{array}$ 
अतः $\begin{array} \mathrm{F} e^{2+} \ =[\mathrm{Ar}] 3 d^6\end{array}$

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