Create a graph with these instrctions On your graph paper, label the x-axis as "Atomic Number." Label the y-axis as "Atomic Mass." There are no units for atomic number, but atomic mass has a unit of (u). This stands for atomic mass units.
2. For each of the first 85 elements in the periodic table, plot a point representing the atomic number (x) and the atomic mass (y).

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before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.