What is an energy band?

(N/A) In a solid,the energy levels of electrons are modified due to the presence of neighboring atoms. Instead of having discrete energy levels as in an isolated atom,the electrons in a solid occupy a range of closely spaced energy levels. This continuous range of allowed energy levels is called an energy band. The two most important bands are the valence band,which contains the valence electrons,and the conduction band,which is higher in energy and allows for electron movement when partially filled.