The number of atoms of each element remains the same before and after a chemical reaction.

Determine whether the statement is true or false.

During a chemical reaction, only the rearrangement of the atoms occurs.
The number of atoms of each element in the reactants and products remains the same in a chemical reaction.

For example $2H_2\left(g\right)+O_2\left(g\right)\to 2H_{2}O\left(l\right)$

In this reaction, we have 4 hydrogen atoms and 2 oxygen atoms on the reactant side and we have the same number of both atoms on the product side also.