Picture (1)shows the electron populations of the bands of MO energy levels for elementary silicon.
-Which picture (1)-(4)shows the electron populations when the silicon is doped with arsenic?
A)picture (1)
B)picture (2)
C)picture (3)
D)picture (4)

Question

Picture (1)shows the electron populations of the bands of MO energy levels for elementary silicon. 
-Which picture (1)-(4)shows the electron populations when the silicon is doped with arsenic?
A)picture (1) 
B)picture (2) 
C)picture (3) 
D)picture (4)

Quizplus · Accepted Answer

Doping with arsenic introduces extra electrons into the silicon lattice, which occupy the donor level just below the conduction band. This results in the conduction band being more populated than the valence band, as shown in picture (2).

Picture (1)shows the Electron Populations of the Bands of MO