Explanation:
In corrosion, a metal is oxidized by loss of electrons to oxygen and the formation of oxides. This process is known as oxidation.

Corrosion:
Corrosion refers to the deterioration of metals due to chemical reactions with their environment. It is a natural process that occurs when metals are exposed to moisture, air, and other corrosive substances. One of the most common forms of corrosion is the oxidation of metals.

Oxidation:
Oxidation is a chemical process in which a substance loses electrons. In the case of corrosion, the metal atoms lose electrons to oxygen molecules. This loss of electrons leads to the formation of metal ions. For example, in the case of iron, the metal atoms lose electrons and are converted into iron ions (Fe2+ or Fe3+).

Loss of Electrons:
When a metal undergoes oxidation, it loses electrons. This is because metals tend to have a low electronegativity, meaning they have a strong tendency to lose electrons and form positive ions. In the process of corrosion, the metal atoms lose electrons to oxygen molecules, which have a higher electronegativity. This transfer of electrons from the metal to oxygen results in the oxidation of the metal.

Formation of Oxides:
When a metal is oxidized, it reacts with oxygen to form metal oxides. These metal oxides are the result of the combination of metal ions with oxygen atoms. The formation of oxides is a characteristic feature of corrosion. Metal oxides are generally less dense and less compact than the original metal, leading to the degradation and deterioration of the metal.

Conclusion:
In summary, in the process of corrosion, a metal is oxidized by the loss of electrons to oxygen and the formation of metal oxides. This oxidation process leads to the degradation and deterioration of the metal.