The oxidation number of a Cobalt (III) ion is +3. This means that the Cobalt atom has lost three electrons.
The cobalt in the formula given has an oxidation number of +3, so that the total charge of the two cobalt ions will balance the total charge of the 3 oxide ions, which have an oxidation number of -2 each.
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.
The metallic ion in cobalt(III) bromide is Co3+ (cobalt with a +3 charge).
The oxidation number of any monoatomic ion is equal to the charge of the ion. For example, the oxidation number of the sodium ion (Na+) is +1, and the oxidation number of the chloride ion (Cl-) is -1.
The molecular formula is CoO Cation is Co^2+^Anion is O^2-^or in other wordscobalt(II) oxide = CoO = Co2+ + O2-
The cobalt in the formula given has an oxidation number of +3, so that the total charge of the two cobalt ions will balance the total charge of the 3 oxide ions, which have an oxidation number of -2 each.
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.
Cobaltic chloride refers to cobalt(III) chloride, where cobalt has an oxidation state of +3. Cobaltous chloride, on the other hand, refers to cobalt(II) chloride, where cobalt has an oxidation state of +2. The main difference is in the oxidation state of cobalt in the two compounds.
Iron(iii) ion = +3
The metallic ion in cobalt(III) bromide is Co3+ (cobalt with a +3 charge).
The oxidation number of any monoatomic ion is equal to the charge of the ion. For example, the oxidation number of the sodium ion (Na+) is +1, and the oxidation number of the chloride ion (Cl-) is -1.
The molecular formula is CoO Cation is Co^2+^Anion is O^2-^or in other wordscobalt(II) oxide = CoO = Co2+ + O2-
A Cobalt ion can have different charges depending on the compound it is a part of. For example, in Cobalt(II) compounds, the Cobalt ion carries a 2+ charge, while in Cobalt(III) compounds, the charge is 3+.
An example is the ferric ion: Fe(III) or Fe3+.
Co = +2 oxidation C = +4 oxidation O = -2 oxidation
'Oxidation number' and oxidation state are often used interchangeably. Oxidation state is a formal way of determining the degree of oxidation of an atom or ion or molecule; for ions the oxidation number is equal to the ionic charge. In non ionic compounds the most electronegative element is assumed to "own" the electrons. So in say InP which is a semiconductor and not ionic, the oxidation state of indium is +III and P is -III. Oxidation number is a convention used in complexes. Ligands are removed from the ion with all bonding electrons. Often the oxidation number and oxidation state have the same values but calculating the the oxidation number of N in ammonia, H is removed as hydride ion, H- you get the strange looking result of nitrogen with an oxidation number of +3. In contrast the oxidation states of N and H would be calculated as -III and +1
The oxidation number of chlorine in iron III hypochlorite is -1. This is because the overall charge of the hypochlorite ion (ClO-) is -1, and in iron III hypochlorite, the iron atom has a +3 charge.