It shows the state of ionisation.
Chemical compounds are not named in Roman numerals!
Roman numerals are used in chemical names to indicate the oxidation state of transition metals in compounds. This is important because many transition metals can exhibit multiple oxidation states, and the Roman numeral clarifies which specific state is present in the compound. For example, in iron(III) chloride (FeCl₃), the Roman numeral III indicates that iron has a +3 oxidation state.
The state that has four Roman numerals in its name is Massachusetts.
A Roman numeral in parentheses, followed by the name of the element, is used for elements that can form more than one positive ion. This is usually seen with metals. Although Roman numerals are used to denote the ionic charge of cations, it is still common to see and use the endings -ous or -ic. These endings are added to the Latin name of the element.
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.'
Chemical compounds are not named in Roman numerals!
Roman Numerals
The state that has four Roman numerals in its name is Massachusetts.
A Roman numeral in parentheses, followed by the name of the element, is used for elements that can form more than one positive ion. This is usually seen with metals. Although Roman numerals are used to denote the ionic charge of cations, it is still common to see and use the endings -ous or -ic. These endings are added to the Latin name of the element.
The oxidation state of transition metals is indicated by Roman numerals in parentheses following the metal's name. For example, iron(II) indicates an oxidation state of +2 for iron, while iron(III) indicates an oxidation state of +3.
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.'
Romann numerals are used: (I), (II)...
because of roman rule
Never
A roman numeral in parentheses follows the name of the metal... apex
In todays notation of Roman numerals: XIX-VII-MMXII Note that in the Roman era 19 was XVIIII and then abridged to IXX as its Latin name suggest
both b and c