what is the difference between conductors and semi-conductors?
include: properties and structure
Whole books have been written on this subject. You will need to do some Googling and then precise your answer. In principle the difference is the result of the outer 'valence' band of electrons and the sharing (bonding) of electrons occupying these bands with adjacent atoms. This is not a trivial task. You will need to devote some time. Good luck.