\( \mathrm{Fe}^{2+} \) (परमाणु क्रमांक \( \mathrm{Fe}=26 \) ) आयन में शेष बचे \( d \)-इलेक्ट्रान...

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\( \mathrm{Fe}^{2+} \) (परमाणु क्रमांक \( \mathrm{Fe}=26 \) ) आयन में शेष बचे \( d \)-इलेक्ट्रानों की संख्या है-
(A) 3
(B) 4
(C) 5
(D) 6
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