Reactivity is a chemical property of a substance, which is the property of a substance to react with another substance.
The notion of chemical property refers to those particularities that lead a certain matter to modify its composition.
That is, a chemical property alters the internal or molecular structure of a substance by interacting with another substance creating a new one.
This is so because the atoms that make up the initial substances break their bonds, rearrange themselves and other new bonds are formed between the atoms present.
Reactivity is a chemical property in which one substance reacts against another, also known as a chemical reaction.
The reactivity of an element measures the tendency to combine with others.
For example, oxygen is one of the most reactive elements in the universe, while neon is one of the least reactive elements.
Therefore, we can conclude that reactivity is a chemical property of a substance, which is the property of a substance to react with another substance.
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