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Because in order for a subsance to undergo reduction and become an oxidizing agent, the substance must gain electrons. Non metals therefore gain electrons while they are in their pure form while metals loose electrons in their pure form.

Examples include:

non metals- Cl2 + 2e- -> 2Cl-

Br2 + 2e- -> 2 Br-

Metals- Sn -> Sn2+ + 2e-

Ni -> Ni2+ + 2e-

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