7. have a melting point. Boiling point, enthalpy of steam under pressure because there is a binding between molecules (that is, labour day doewan), but the melting point. Boiling point, enthalpy of the occurrence of an increased. When atomic number increases because they have more doewan day. In addition, evaporation of chemical group VIIA will be gradually reduced. When atomic number increases because of the strong increase in doewan day.
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