There are 14 statements. How many of them are True? ii Electrons in the outermost shell are called valence electrons ii The valence electrons shared betwen atoms form a covalent bond iv In order to break the covalent bond, the valence electron must gain a minimum energy called bandgap energy. v An intrinsic semiconductor is a single crystal semiconductor material with no other types of atoms within the crystal vi The lack of an electron in the covalent bond is called a hole. vii Group V elements are called donor impurity. viii Group I elements are called acceptor impurity. ix Adding Group I r Group Velements into a semiconductor crystal is called doping. XA semiconductor that contains Group II aoms is called p-type semiconductor. xi A semiconductor that contains Group V atoms is called n-type semiconductor. xii The movement of an electron due to electric field is called drift. xiii The flow of electrons due to concenration difference is called diffusion. xiv The velocity of the electrons in an electric field is proportional the electric field intensity. The proportionality constant is called mobility. XV In an n- type semiconductor electrons are majority carriers whereas the holes are minority carriers.