What is decomposition reaction ??​
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Decomposition reactions are processes in which chemical species break up into simpler parts. Usually, decomposition reactions require energy input. For example, a common method of producing oxygen gas in the laboratory is the decomposition of potassium chlorate (KClO3) by heat.

Explanation:

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A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.

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neutrons are in the middle of the atom and the electrons, which are much smaller.

dynamic equilibrium is the answer.