Why is the more covalent character, the less the melting point?

The covalent compounds have low melting and boiling points.

There is a reason behind this phenomenon.

In case of covalent compounds the molecules are non-polar and even if there is a polarity in the molecule, that is also just for a moment. Thus each molecule exists as a discrete particle which do not have affinity for other molecules.

And the intermolecular forces in covalent compounds are very low thus very less energy is required to change the state from solid to liquid and from liquid to gas.

Ionic compound

But in case of ionic compounds there are ions (atoms with positive and negative charges) which attract each other strongly. And due to this it exists as a 3 dimensional networking molecule. Due to higher intermolecular forces the melting and boiling points of Ionic compounds are higher.

Published by Ankush Sharma

I am M.Sc (chemistry ) from Punjabi University Patiala. I am a science teacher with expertise in chemistry, with 8 years of experience in teaching. Writing and blogging is my hobby, I write whenever I am free. I am constantly working on creating a new and easy way of learning the tough things in an effective way. I am constantly working to make authentic and reliable information to be shared with my students and widen the horizons of knowledge.

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