Based on the respective intensities of the interparticle attractions, NH2OH > CaCl2 > PCl3 > KI > Cl2 > CH4.
Helium has the lowest melting point of all chemical elements, and carbon has the greatest melting point. The melting point is measured in degrees Celsius.
The molecule with the highest melting point is carbon, and the one with the lowest melting point is helium.
Higher melting points are typically caused by the presence of polar groups on organic compounds, particularly hydrogen-bonding groups. A very strong correlation exists between molecular form and a molecule's capacity to fit closely into a crystal lattice.
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