What is the complete ground-state electronic configuration of the iron(III) ion (FeĀ³āŗ)? (Atomic number of Fe = 26)
Answer and explanation
Correct answer: A. 1sĀ² 2sĀ² 2pā¶ 3sĀ² 3pā¶ 3dāµ
- Step 1: Neutral iron (Z = 26) configuration is [Ar] 3dā¶ 4sĀ². Step 2. During ionization, transition metals lose the outermost 4s electrons before 3d electrons. Step 3. FeĀ³āŗ loses two 4s electrons and one 3d electron: [Ar] 3dāµ (half-filled, stable d-subshell). Answer: 1sĀ² 2sĀ² 2pā¶ 3sĀ² 3pā¶ 3dāµ. Why not the others: The second configuration is neutral Fe; the others represent incorrect ionization orders.
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