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Fe2+
Ferrous ion, a form of the iron ion where iron has a valency of +2, commonly involved in redox reactions and an essential part of hemoglobin.
Oxygen
A chemical element with symbol O and atomic number 8, essential for respiration of living organisms and combustion processes.
Compound
A compound is a substance made up of two or more different elements chemically bonded together in a fixed ratio.
Ag+
A silver ion, typically carrying a single positive charge, often used in silver compounds or in photography.
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