Question
$Fe ^{2+}$ आयन का इलेक्ट्रॉनिक विन्यास लिखिए।

Answer

${ }^{26} Fe =1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^6 4 s^2$ अत: $Fe ^{2+}=[ Ar ] 3 d^6$

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