Answer :
The law that is responsible for having the same number and type of atoms present in the reaction at the beginning and the end is law of conservation of mass.
According to the law of conservation of mass can neither be create a nor be destroyed.
So, if the chemical reaction is performed in a close system present in it before the reaction must remain same after the reaction.
We also know each and every element has its unique property and unique weight.
If the type of atom is changed in a chemical reaction then it means that the law of conservation of mass should not be valid which is indeed not a correct thing.
Hence, according to law of conservation of mass is responsible for having the same number and type of atoms at beginning and the end of the chemical reaction.
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