Why does Phosphorus have a higher melting point than Chlorine?

Phosphorus exists as P4 and chlorine as Cl2 so elemental phosphorus is a bigger molecule than chlorine. Neither of these molecules has a dipole so both have only induced dipole-dipole (or Van Der Waal's) forces between each molecule. This is due to the random movement of electrons in the molecule creating instantaneous dipoles in each molecule which therefore induces instantaneous dipoles in the neighbouring molecules. The interaction between the dipoles of these molecules (an intermolecular force) stabilises the solid form of the molecule. P4 is bigger than Cl2 and it has more electrons therefore stronger Van Der Waal's forces so a higher melting point as more energy is needed to overcome these intermolecular forces.

Answered by Rory S. Chemistry tutor

14061 Views

See similar Chemistry A Level tutors

Related Chemistry A Level answers

All answers ▸

What is the difference between a sigma and pi bond? Use your answer to explain why there is fixed rotation about the C=C bond.


What are Acids and Bases?


State what is meant by term enthalpy change of neutralisation


What is the definition of "Enthalpy Change of Formation"


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences