Question

what is reactents??​

Answer 1

A substance that takes part in and undergoes change during a reaction.

Example of reactents

The vast majority of reactions include two or more reactants that react to give one or more products. One simple example of a reaction in which two reactants produce a single product is the reaction of the acid, hydrochloric acid (HCl), and the base, ammonia (NH3).

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Answer 2

when two elements or compounds mixed together to perform a reaction it is known as reactants. For example :

C+02= CO2

here c and O2 are the reactant and CO2 is the product of reaction

not only elements are reactant although compounds of those and more compounds  elements may be the reactant.