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What does the roman numeral in a chemical formula stand for?
It indicates the oxidation state.
What does the roman numeral tell about an element?
Roman numerals are used to identify the oxidation state of transition metals with more than one possible oxidation state.
What does roman numeral in parenthesis after the name of the element?
It is the oxidation state of the element, usually positive and used with metals. It can also be used without brackets and in superscript.
Do Na2O have a Roman numeral?
No, Na2O does not have a Roman numeral. When we talk about sodium oxide (Na2O), we are dealing with sodium and oxygen. We know that sodium has a +1 oxidation state in nearly everything it reacts with. You can pretty much bet on it. As it is essentially always going to combine in this +1 oxidation state, there is no need to differentiate that oxidation state from another one, which is what Roman numerals do.Oxygen has (almost always) a -2 oxidation state, and that means it takes two +1's to balance with a -2. Sodium, with its +1 oxidation state, will combine in a two-to-one ratio with oxygen, with its -2 oxidation state, to make the oxide.
The result or effect of changing the Roman numeral IV?
At one time the Roman numeral IIII represented the number 4 but in an effort to make it conform with the rules of writing Roman numerals, which state that no numeral should appear more than three times in succession, IIII was dropped in favour of IV. This means that it conformed with the gerneral pattern, after all XL = 40 (XXXX is never used) and CD = 400 (CCCC is never used).
