In a redox reaction, the oxidizing agent undergoes oxidation the reducing agent undergoes reduction the oxidizing agents undergoes reduction the oxidizing agent loses electrons

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Oxidation involves loss of electrons.

Reducing agents undergo oxidation and thus lose electrons in a redox reaction.

Metals are good reducing agents due to low value of ionization enthalpy.

Reduction involves gain of electrons.

Oxidizing agents undergo reduction and thus gain electrons in a redox reaction.

Nonmetals are good oxidising agents due to high value of electron affinity.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons