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Atomic number of iron is 26. It exhibits Fe2+ , Fe3+ oxidation state. Write the sub shell electronic configuration.

  Sub shell electronic configuration
 Fe
 Fe2+
  Fe3+

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  Sub shell electronic configuration
 Fe  1s22s22p63s23p63d64s2
 Fe2+  1s22s22p63s23p63d6
  Fe3+  1s22s22p63s23p63d5

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