Question

what is Oxidation number ​

Answer 1

heya

the oxidation state, sometimes referred to as oxidation number, describes the degree of oxidation of an atom in a chemical compound

Answer 2

$\huge\mathfrak{\underline{\underline{Oxidation \:Number}}}$

The concept of electron transfer is found unable to explain the redox changes or electron shift in case of covalent compounds. To explain these changes a new concept, called oxidation number is introduced. Oxidation number is defined as the charge that an atom of the element has in its ion or appear to have when present in the combined state with other atoms.

Or

In other words, it is also defined as the charge that an atom appear to have in a compound when all other atoms are removed as ions from the compound.