How are compounds formed?

When two elements are combined through a chemical reaction then a compound forms. For example water is a compound formed from the combination of hydrogen and oxygen.

2H2 + O2 → 2H2O.

Complex molecules such as proteins are formed by a series of reactions involving elements and simple compounds.

Another example is A reaction between sodium and chlorine giving the compound sodium chloride. A new substance is formed when two atoms combines to form a compound. Compounds are written with formulas showing which elements from the periodic table are combined.

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