The chemical element with the highest melting point is tungsten, at 3,414 °C (6,177 °F; 3,687 K); this property makes tungsten excellent for use as electrical filaments in incandescent lamps.

Heating a solid transfers energy to the molecules. So, the melting point depends on the energy it takes to overcome the forces between the molecules, or the intermolecular forces, holding them in the lattice. The stronger the intermolecular forces are, the more energy is required, so the higher the melting point is.

Boiling point: the temperature (at constant pressure) where a liquid converts entirely to a gas as long as heat is applied. As the strengths of intermolecular forces increase, surface tension, viscosity, melting point and boiling point increase, while vapor pressure decreases.

Answer: As the intermolecular forces of attraction increases, the boiling point also increases.

Hydrogen bonding

Higher the intermolecular forces between the liquid particles, harder it is for it to escape into the vapor phase, ie., you need more energy to convert it from liquid to the vapor phase, in other words, higher its boiling point.

The higher the vapor pressure of a liquid at a given temperature, the lower the normal boiling point (i.e., the boiling point at atmospheric pressure) of the liquid.

Again, if the volume of the substance’s liquid phase is less than the volume of the solid phase, its melting point will decrease upon the increase of volume. The boiling point of liquids always increases when pressure is applied on that liquid.

If the intermolecular forces are small, the liquid has a high vapour pressure. Little heat energy will have to be added to separate the molecules, so the boiling point will be low. More heat will be required to separate the molecules, so the boiling point will be higher.

As the pressure of substance increases, particles tends to remains compacted, increasing of pressure during melting hindering in melting process, makes it difficult to overcome the strong force of attraction, i.e. more thermal energy is required. That’s why the melting point increases as the pressure increase.

Molecular composition, force of attraction and the presence of impurities can all affect the melting point of substances.

Pressure does not effect melting point much. For most substances, increasing the pressure when a system is in equilibrium between liquid and solid phases will increase the phase transition temperature. Water is one of a few special substances for which the pressure lowers the temperature of transition.