Asystem used to represent the valence electrons around the chemical symbol of an element is the

Mendeleev's periodical table.

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