I'm confused. Iron has 26 electrons and I wrote down $\ce{1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^6}$ yet my answer booklet says $\ce{1s^2, 2s^2, 2p^6, 3s^2, 3p^6}$ but that is only 18. How can it be 18 if $\ce{Fe}$ (iron) is 26? What am I doing wrong?

Thank You

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    $\begingroup$ I'm voting to close this question as off-topic because the answer summarises in you're right and book wrong. $\endgroup$ – Mithoron Oct 3 '18 at 20:33
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    $\begingroup$ @Mithoron - I disagree. RTStriker made a huge mistake. "What am I doing wrong? " You believed the book was infallible. ;-) $\endgroup$ – MaxW Oct 3 '18 at 21:31
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    $\begingroup$ Many books have an erratum list somewhere. You might try to look yours up for other stupid mistakes. $\endgroup$ – MaxW Oct 3 '18 at 21:33
  • $\begingroup$ @Mithoron I'd leave it open. It's a good example for an acceptable homework question: RTStriker describes their assignment, their own solution AND the reason for their doubts. I don't see, why "your book is wrong" was a valid close reason. $\endgroup$ – Arsak Oct 4 '18 at 10:22
  • $\begingroup$ @Marzipanherz No, this is example of question, that even if not closed, should get later deleted in "Spring Cleaning" $\endgroup$ – Mithoron Oct 4 '18 at 13:58