Complete the statements by writing the number from the graph. 1. The substance is in the gas phase only in region _
.
2. The substance is in both the liquid and the solid phase in region _
.
3. The substance is in only the liquid phase in region _
.
4. The melting point is the temperature at region _
.
5. The boiling point is the temperature at region _

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.