How are metals different from nonmetals

Metals: lustrous (shiny) good conductors of heat and electricity high melting pointhigh density, malleable (can be hammered) ductile usually solid at room temperature

Nonmetals: not lustrous, poor conductors of heat and electricitynonductile solidsbrittle solidsmay be solids, liquids or gases at room temperaturetransparent as a thin sheetnonmetals are not sonorous

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.