Question
Explain that the nature of electron motion in a solid is very different from that in an isolated atom.

Answer

According to the Bohr atomic model, in an isolated atom, the energy of any of its electrons is decided by the orbit in which it revolves.
But when the atoms come together to form a solid, they are close to each other.
So the outer orbits of the electrons from neighbouring atoms would come very close or could even overlap.
This would make the nature of electron motion in a solid very different from that in an isolated atom.

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