Use the periodic table to determine the atomic number, atomic mass, mass number, and number of protons, electrons, and neutrons in the first 20 elements

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

It's called the falling actionwrong subject by the way