Is there a name for the law that in chemical reactions atoms are conserved?

One characteristic of chemical reactions is the trivial fact that the number of atoms of a given element is conserved. This is not conservation of mass, albeit conservation of mass is a consequence of this fundamental property.


I guess that at some point in history philosophers found this basic property, probably somewhat around the time, when the law of constant proportions was found?


Does anybody now a name for that law? Or the name of the person that first stated it?


