It is the oxidation state of the element, usually positive and used with metals. It can also be used without brackets and in superscript.
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to present the oxidation numbers of transition elements according to IUPAC System.
The name Claudio cannot be formed from Roman numerals as, even if you replaced the letter 'u' with the numeral V, there is no Roman numeral with the symbol 'a.'
The bar in Roman Numerals is named vinculum. This bar is placed above a Roman Numeral and indicates a multiple of 1000. The Romans did not use this name for the bar, it was introduced in the Middle Ages.
XX is the Roman numeral for 20
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