Related Questions

Is an element used in semiconductors whose atoms have three valence electrons.
A An acceptor
B A donor
C Germanium
D Silicon
A semiconductor has generally ___________ valence electrons.
A 2
B 3
C 6
D 4
A pentavalent impurity has ___________ Valence electrons
A 3
B 5
C 4
D 6
In a metal, the valence electrons
A Are not shared
B Are shared only between neighbouring atoms
C Are shared by all atoms
D Either B or C
A trivalent impurity has valence electrons
A 4
B 5
C 6
D 3
Which of the following elements has three valence electrons?
A Al
B Ag
C Au
D Ca
A free electron is a valence electron that has broken away from its parent atom.
A True
B False
The valence electron of a copper atom experiences what kind of attraction toward the nucleus?
A Strong
B Neutral
C Weak
D Impossible to say
E None of the above
How many protons does the nucleus of a silicon atom contain?
A 4
B 29
C 14
D 48
E None of the above
An SCR is made of silicon and not germanium because silicon
A Is inexpensive
B Is mechanically strong
C Has small leakage current
D Is tetravalent

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