Determine the total sum of all unpaired electrons present in the ground state electronic configurati — Atomic Structure Chemistry Question

💡 Solution & Explanation

$Fe^{2+}$ ($d^6$) has 4 unpaired electrons. $Co^{2+}$ ($d^7$) has 3 unpaired electrons. $Ni^{2+}$ ($d^8$) has 2 unpaired electrons. Sum = $4 + 3 + 2 = 9$.