# What is the energy in eV between atoms in a typical solid state material?

Comps 2 question:

What is the energy in eV between atoms in a typical solid state material ?

Just rough estimate ?

How is that related to the thermal energy that needs to be supplied in order to melt it ?

For example a typical bond has 1eV but we need much smaller energy to break it, why is that ?

For NaCl the latice energy is 800kJ/mol which is 7eV per atom.

Where is the mistake here ?

1eV = 6.10^18 eV, 1eV = 11000K

Thanks a lot!

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I think this is a fair question. As solid state is not my field I will look around and try to understand the reason for this . I suspect that it has to do with the statistical fact that temperature is proportional to the root mean square of the kinetic energy, whereas the 1 ev to temperature is just a convention about units. –  anna v Sep 25 '12 at 13:29