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Minium is a mixed compound of leadoxides. Pb3o4 actually exists as a mixture of PbO and PbO2 in the ratio 2:1. The oxidation states of each are +2 and +4. oxidation number- the charge that appears on any atom of a molecule is known as its oxidation no. 

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Oxidation Number of Pb in Pb3O4

Introduction
The oxidation number of an element is the charge it would have if all its bonds were ionic. In Pb3O4, the oxidation number of lead (Pb) can be determined by analyzing the structure of the compound.

Structure of Pb3O4
Pb3O4 is an oxide compound that consists of three lead atoms and four oxygen atoms. The structure of Pb3O4 can be represented as a tetragonal crystal lattice with Pb2+ and Pb4+ ions occupying the lattice sites. The oxygen atoms are shared between the lead atoms to form oxide bridges.

Determining the Oxidation Number of Pb
To determine the oxidation number of Pb, we need to consider the electronegativity of the atoms and their bonding. Oxygen is highly electronegative, which means it attracts electrons towards itself. In Pb3O4, the oxygen atoms are bonded to the lead atoms through covalent and ionic bonds. The covalent bonds involve the sharing of electrons between the atoms, while the ionic bonds involve the transfer of electrons from one atom to another.

In Pb3O4, the Pb atoms have different oxidation states. Two of the Pb atoms have an oxidation state of +2, while one of the Pb atoms has an oxidation state of +4. This is because the oxygen atoms form oxide bridges between the Pb atoms, which can be considered as covalent bonds. The Pb atoms that are bonded to two oxygen atoms have an oxidation state of +2, while the Pb atom that is bonded to four oxygen atoms has an oxidation state of +4.

Conclusion
The oxidation number of Pb in Pb3O4 is +2 and +4. Two of the Pb atoms have an oxidation state of +2, while one of the Pb atoms has an oxidation state of +4. This is because the oxygen atoms form oxide bridges between the Pb atoms, which can be considered as covalent bonds.