30 Questions
What type of bonding holds the atoms together in a crystal structure?
Covalent bonding
Why are pure silicon and germanium poor conductors of electricity?
Due to covalent bonding holding valence electrons tightly
What type of semiconductor has impurities added by a process called doping?
Extrinsic semiconductor
What happens when intrinsic silicon gains sufficient heat?
The covalent bonds break allowing electrons to escape
In extrinsic semiconductors, what effect does the doping process have on conductivity?
Enhances conductivity
What makes semiconductive materials conduct in terms of electrons and holes?
Electrons in the conduction band and holes in the valence band
What is the primary function of valence electrons in an atom?
To dictate the nature of chemical reactions and electrical properties
What do you call an atom with four valence electrons?
Tetravalent
What is the characteristic of a balanced atom?
It has an equal number of protons and electrons
What happens when the negative charge of electrons cancels the positive charge of protons in an atom?
The atom becomes electrically neutral
What type of material has conduction bands and valence bands that are not separated?
Semiconductor
How many valence electrons does Carbon have?
6
What happens to some valence electrons in an intrinsic silicon crystal at room temperature?
They jump the gap from the valence band into the conduction band, becoming free electrons
What is the movement of holes in a semiconductor material called?
Hole current
What is the primary characteristic of an insulator?
It has no free charge carriers and is non-conductive
What happens when a conduction-band electron loses energy and falls back into a hole in the valence band?
It recombines with a hole
What occurs in an insulator when the temperature increases?
The bonds break and free electrons are generated
Why are thermally generated free electrons in the conduction band attracted toward the positive end when a voltage is applied?
Because they are negative charge carriers
What is left in the valence band when a valence electron jumps into the conduction band?
A hole
What is unique about the bonding in a silicon crystal?
The bonding is strengthened by the sharing of valence electrons
What is the primary difference between an insulator and a semiconductor?
Semiconductors have a finite probability of electrons being knocked loose from their position
In the valence band, how do electrons move into nearby holes?
With a little change in energy
What is the characteristic of an intrinsic semiconductor material?
It is chemically very pure and possesses poor conductivity
What is the purpose of covalent bonding in a silicon crystal?
To strengthen the bonding arrangement between atoms
According to the Bohr model, what is the electric charge of an electron?
1.602 x10^-19 C
What is the atomic number of an element if its atom contains 20 protons?
20
How many electrons can the outermost shell of an atom hold, according to the information given?
8
Which particles in Bohr's model determine the element's chemical properties?
Protons
Considering the given information, which property makes an atom stable?
Having a fully filled outermost shell
What is the electric charge of a proton?
Positively charged with the same magnitude as an electron
Test your knowledge on atoms and atomic structure in basic electronics with this quiz. Learn about the components of an atom, electron movement, stability criteria, and atomic number calculations.
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