The formula of dimercury oxide is Hg2O.
It is a black compound with a density of 9900 kg m-3.
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The percentage of iron oxide in iron oxide is ... yep, you guessed ... 100%!
The Roman numeral following the cation tells you the oxidation number of that cation. For example, Cu(ll)chloride tags you it is CuCl2 because the (ll) after Cu indicates an ox. no. of 2+.
O2- is the symbol for the oxide ion, which is an oxygen atom that has gained two electrons. The oxide ion has a charge of -2.
manganese(VII) oxide
Manganese VII oxide.