What do the roman numerals mean?

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Faisal Alshamaa - 1L
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What do the roman numerals mean?

Postby Faisal Alshamaa - 1L » Thu May 17, 2018 6:14 pm

For example, (Hw 3.27) manganese(IV) oxide is MnO2. What do the roman numerals mean and how does that influence the answer of the chemical formula of it?

Chem_Mod
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Re: What do the roman numerals mean?

Postby Chem_Mod » Thu May 17, 2018 6:55 pm

The roman numerals refer to the charge on that metal or element, this is referred to as its "oxidation state". There are rules for oxidation state of elements, for example oxygen will almost always have an oxidation state of -2. This means in MnO2 there are 2 oxygens of oxidation state -2 giving them a combined oxidation state of -4. This means to balance the oxidation state of the oxygens the Mn must be +4. We generally use roman numerals in particular when referring to the oxidation state of the metal. That is why it says Mn(IV) since that is the roman numeral for four.

Adam Yaptangco 1D
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Re: What do the roman numerals mean?

Postby Adam Yaptangco 1D » Sun May 20, 2018 3:33 pm

Roman numerals are a part of nomenclature for compounds when an ion can have multiple charges. The Roman numeral shows the charge of the ion.


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