An atom with an atomic number of 6 has 6 electrons and 6 protons The third shell of an atom can have 2n2 = 2(3)2 = 18 electrons
Section 1-2 Semiconductors, Conductors, and Insulators
The materials represented in Figure 1-40 in the textbook are (a) insulator (b) semiconductor An atom with four valence electrons is a semiconductor.
Section 1-3 Covalent Bonds
In a silicon crystal, each atom forms four covalent bonds.
Section 1-4 Conduction in Semiconductors
When heat is added to silicon, more fiee electrons and holes are produced. Current is produced in silicon at the conduction band and the valence band.
Section 1-5 N- Type and P- Type Semiconductors
8. Doping is the carefully controlled addition of trivalent or pentavalent atoms to pure (intrinsic) semiconductor material for the purpose of increasing the number of majority carriers (fiee electrons or