Answer
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Step 1I'll solve this step-by-step following the specified LaTeX formatting guidelines:
Step 2: Determine the electron configuration of iron
1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{6}
Iron's atomic number is 26, so we need to write out its complete electron configuration:
Final Answer
An atom of iron has 8 \text{ valence electrons}.
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