How do scientists determine whether a chemical reaction releases or stores energy? Scientists can calculate the bond energies of the reactants and the products. products. Scientists compare the total bond energies of the reactants and the products. products. Scientists know that each chemical has its own unique bond energy. energy. All of the above above

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answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.