Hi,I'm doing Edexcel AS Physics.The topic is about Electricity.
So,I have a question.Conduction is caused due to free electrons,and a substance can conduct if it only has free electrons.
Whether or not the substance can have free electrons,is determined by the band theory.
So,when many atoms join together to form a crystal,it forms an energy band.The outermost shell band is specifically called the valence band.The electrons in the valence band has a range of energy levels,and if supplied with the right energy,it will move to conduction band.
First of all,was my explanation correct till this point?And second of all,what does conduction band actually mean?Does it mean the electrons(valence electrons) go to higher energy levels ,or what?
I mean,what exactly is the conduction band?