In which way does a balanced chemical equation demonstrate the conservation of matter? A. It shows how the atoms of an element can appear on only one side of the equation.
B. It shows how matter can be both created and destroyed by a chemical reaction.
C. It shows the same number of atoms of each element on both sides of the equation.
D. It shows the same number of molecules of each compound on both sides of the equation.

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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.