How many ions in a formula unit of #FeO#, #"ferrous oxide"#?

1 Answer
anor277
Dec 22, 2017

TWO.....

Explanation:

You gots #"ferrous oxide"#, i.e. #FeO#...the #"ous"# ending signifies the LOWER oxidation state,,,,#"ferric oxide"# is #Fe_2O_3#, i.e. the oxide of #Fe^(3+)#...

And formally #FeO# is composed of ONE #Fe^(2+)# ion, and ONE #O^(2-)# ion... So two ions in total. Capisce?

Typically oxygen forms the #O^(2-)# ion....what number of ions in #"ferric oxide"#, #Fe_2O_3#?

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