How do valence electrons create positive and negative ions?

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

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.

The water cycle increase the water content in the earth atmosphere

Um i think answer is a