Answers: 1
and oxygen.
![[Fe]^{2+}=1s^22s^22p^63s^23p^63d^6](/tpl/images/0032/1412/2e956.png)
![[O]^{2-}=1s^22s^22p^6](/tpl/images/0032/1412/cd710.png)
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What is the formula unit for a compound made from fe2+ and oxygen? ofe feo fe2o o2fe...
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