Consider this reaction: Fe2O3(s)+3H2(g)=2Fe(s)+3H2O(g) =98.7kJ If this system was in closed container at equilibrium, and a small about of hydrogen gas was injected into the container, how would the reaction respond? Or which direction would the reaction “shift” towards? Options: 1) Making more reactants 2) making more products

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.