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It is only needed after transition metals, so it should say how many valence electrons are in the transition metal. Ex: If iron has 3 valence electrons and it is combined with oxygen, it would be written as Iron (III) oxide.
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Wiki User
∙ 12y ago
Wiki User
∙ 13y agoThe roman numeral indicates the charge of the ion in question. Some ions can have many different or various charges such as Iron and Manganese.
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When naming a transition metal ion that can have more than one common ionic charge the numeric value of the charge is indicated by what?
Transition metals form more than one ionic charge; Roman numerals (in parentheses) follow the ion's name. Cu2+ is copper (II) ion.
What does the roman number III indicate in cobalt III oxide indicate?
The roman number III indicates that the ion of cobalt present in this form of cobalt in the cobalt oxide is Co3+. Since cobalt also exists as a Co2+ form, these must be distinguished in some way. The standard is to use roman numerals to denote the charge. Both Cobalt (III) oxide and Cobalt (II) oxide still have the chemical formula of Co3O4.
What is the rule when writing the name of an ionic compound that contains a transition metal?
To indicate the oxidation number using Roman numerals. e.g. Ferric oxide or ferrous oxide /??? Which Ferric oxide (Fe(II)O). Ferrous oxide (Fe2(III)O3). or Potassium permasnganate KMnO4 The manganese is (+7) . hence KMn(VII)O4
When naming a transition metal ion that can have more than one common ionic charge the numerical value of the charge is indicated by a .?
Roman numerals are used: I, II, III.
What does the roman numerals mean on Iron II?
The II indicates the charge or oxidation state of iron, which in this case is 2+. Roman numerals are often used to show the oxidation states or ionic charges of metals in their compounds (which are always positive). Iron can also form the iron III ion which carries a 3+ charge.
What type of charge do the roman numerals in a cation indicate?
Cation = negative ion
Why is it necessary to use Roman Numerals when writing a name for a compound?
Because some elements have different amounts of ions. The roman numerals are used to determine which ion is being used.
Do roman numerals appear in covalent compound?
No, Roman numerals are not used in covalent compounds. Roman numerals are used in the naming of ionic compounds to indicate the charge of a transition metal ion. In covalent compounds, the elements are combined through sharing of electrons and do not involve ions with specific charges.
Name this binary ionic compound PbCl4 in roman numeral to indicate the chaarge on the metal ion?
Lead(IV) Chloride
Why roman must be included in the names of MnO2 and Mn2O7?
In this case the roman numerals indicate the oxidation state of the cation portion of the polyatomic ion: [Fe(II)O2]2- as opposed to [Fe(III)O2]1- Mn(II)=Mn2+ Mn(VII)=Mn7+
What does a Roman numerals represent in a chemistry?
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.
When naming a transition metal ion that can have more than one common ionic charge the numeric value of the charge is indicated by what?
Transition metals form more than one ionic charge; Roman numerals (in parentheses) follow the ion's name. Cu2+ is copper (II) ion.
What does the roman number III indicate in cobalt III oxide indicate?
The roman number III indicates that the ion of cobalt present in this form of cobalt in the cobalt oxide is Co3+. Since cobalt also exists as a Co2+ form, these must be distinguished in some way. The standard is to use roman numerals to denote the charge. Both Cobalt (III) oxide and Cobalt (II) oxide still have the chemical formula of Co3O4.
If you have an ion that is a transition metal you need to write the charge as what?
The charge it's written in parentheses with Roman numerals: Fe(II).
Roman numerals in a cation represent?
the number of electrons lost when forming an ion and that the cation can form more than one cation.
When do you need to use a roman numeral in the name of a compound?
Roman numerals are typically used in compound names to indicate the oxidation state of an element. This is necessary when the element can have multiple oxidation states and is written as a cation in the compound. For example, iron can exist in the +2 or +3 oxidation state, so the compound name "iron(II) chloride" specifies that it is the +2 oxidation state of iron.
What is the name for the ion O2-?
O2- ion is known as peroxide in English. As it is not a transition metal ion, it is not able to be written any other way. If it were a transition metal such as Lead (Pb), the Pb4+ ion can be called lead (IV) or plumbic. Lead (IV) is written in the Stock method with roman numerals representing the electrons in the ion. Plumbic is written in the Classical method with the suffixes "ic" and "ous". As some transition metals have two different ions, "ic" is added to the higher ion name while "ous" is added to the lower ion name.
