Aluminium, Gallium,Indium, Thallium show O.S. of +3.
Since Ununtrium is also placed in group 13, it might show O.S of +3 as well.
In 3d transition series,
Scandium,Titanium, Vanadium,Chromium,Manganese,Iron,Cobalt,Nickel show the oxidation state of three.
In 4d transition series,
Yttrium, Zirconium,Niobium, Molybdenum,Technetium,Ruthenium, Rhodium, Silver.
In 5d transition series,
Hafnium,Tantalum,Tungsten, Rhenium,Osmium,Iridium, Gold,Platinum show O.S. of +3.
Also, All the Lanthanides elements show oxidation state of +3.
Among the Actinides, Actinium, Protactinium, Uranium,Neptunium,Plutonium,Americium,Curium, Berkelium, Californium,Einsteinium,Fermium,Mendelevium,Nobelium and Lawrencium show oxidation state of +3.
Apart from these, Meitnerium is also predicted to show O.S. of +3 .
The oxidation number of Fe in Fe3+ is +3. This is because Fe is a transition metal and can exhibit multiple oxidation states. In this case, Fe has lost three electrons to form a 3+ charge.
Cobalt is a transition metal. Its oxidation states are 2 (3).
The oxidation number of nitride (N3-) is -3. This is because nitrogen typically has a valence of -3 when it forms an ionic compound with a metal.
From '0' to '3'. Elemental aluminium is in oxidation state zero (0). When it combines with oxygen to form aluminium oxide , it 'looses' its three outermost electrons to oxygen. Hence aluminium metal becomes the aluminium cation (Al^3+), which is oxidation state '3'.
The oxidation number of potassium (K) is always +1 because it is an alkali metal in group 1 of the periodic table. The oxidation number of nitrogen (N) in compounds is typically -3. Therefore, in K3N, the oxidation number for K is +1, and for N, it is -3.
Oxidation number of Li is +1. Oxidation number of oxygen is -2.
A metal and a nonmetal would form an ionic bond. In an ionic compound, a metal ion would have a positive oxidation number equal to its ionic charge. A nonmetal would have a negative oxidation number equal to its ionic charge.Examples:NaCl oxidation numbers: sodium has an oxidation number of +1, chloride has an oxidation number of -1. So the overall charge of NaCl is zero.CaCl2 oxidation numbers: calcium has an oxidation number of +2, the chloride ion has an oxidation of -1. Since there are two chloride ions, the total negative oxidation number is -2, so CaCl2 has an overall charge of zero.
Zero The oxidation number of an element in its elemental form is always zero.
Since manganese is a metallic element, its oxidation number in metallic form is 0, as for any other element.
Hydrogen has an oxidation number of +1 in most of its compounds and -1 in metal hydrides and hydrocarbons.
Metallic aluminium has the oxidation number zero. In compounds in the form of ions, it takes the oxidation number +III.Metallic aluminium has the oxidation number zero. In compounds in the form of ions, it takes the oxidation number +III.
The most common oxidation number for nickel is +2. Nickel is a transition metal that can also exhibit oxidation states of +1, +3, and +4, but the +2 oxidation state is the most stable and commonly observed.