In a chemical reaction mass is converted what is it mean

Mass is not conserved in chemical reactions. The fundamental conservation law of the universe is the conservation of mass-energy. According to Einstein's famous equation, E = mc2, mass can be transformed into energy and energy can be transformed into mass.

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.