What occurs in a chemical reaction?

no new atoms or formed or destroyed.reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Chemical reaction is a process in which reactants are converted into one or more substance (products), which have properties different from the reactants. In a chemical reaction there will be rearrangement of constituent atoms and molecules but there will be no change in the nucleus. Nuclear chemistry is a sub-discipline of chemistry that involves the chemical reaction unstable radioactive elements.

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we would need to see the picture to answer it