Basic Electronics: Introduction to Atoms and Atomic Structure Quiz

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What type of bonding holds the atoms together in a crystal structure?

Ionic bonding

Metallic bonding

Hydrogen bonding

Covalent bonding (correct)

Why are pure silicon and germanium poor conductors of electricity?

Due to the presence of free electrons

Due to the presence of positive charge holes

Due to covalent bonding holding valence electrons tightly (correct)

Due to the presence of metallic bonding

What type of semiconductor has impurities added by a process called doping?

Intrinsic semiconductor

Metallic semiconductor

Extrinsic semiconductor (correct)

Molecular semiconductor

What happens when intrinsic silicon gains sufficient heat?

The covalent bonds break allowing electrons to escape Signup and view all the answers

In extrinsic semiconductors, what effect does the doping process have on conductivity?

Enhances conductivity Signup and view all the answers

What makes semiconductive materials conduct in terms of electrons and holes?

Electrons in the conduction band and holes in the valence band Signup and view all the answers

What is the primary function of valence electrons in an atom?

To dictate the nature of chemical reactions and electrical properties Signup and view all the answers

What do you call an atom with four valence electrons?

Tetravalent Signup and view all the answers

What is the characteristic of a balanced atom?

It has an equal number of protons and electrons Signup and view all the answers

What happens when the negative charge of electrons cancels the positive charge of protons in an atom?

The atom becomes electrically neutral Signup and view all the answers

What type of material has conduction bands and valence bands that are not separated?

Semiconductor Signup and view all the answers

How many valence electrons does Carbon have?

6 Signup and view all the answers

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 Signup and view all the answers

What is the movement of holes in a semiconductor material called?

Hole current Signup and view all the answers

What is the primary characteristic of an insulator?

It has no free charge carriers and is non-conductive Signup and view all the answers

What happens when a conduction-band electron loses energy and falls back into a hole in the valence band?

It recombines with a hole Signup and view all the answers

What occurs in an insulator when the temperature increases?

The bonds break and free electrons are generated Signup and view all the answers

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 Signup and view all the answers

What is left in the valence band when a valence electron jumps into the conduction band?

A hole Signup and view all the answers

What is unique about the bonding in a silicon crystal?

The bonding is strengthened by the sharing of valence electrons Signup and view all the answers

What is the primary difference between an insulator and a semiconductor?

Semiconductors have a finite probability of electrons being knocked loose from their position Signup and view all the answers

In the valence band, how do electrons move into nearby holes?

With a little change in energy Signup and view all the answers

What is the characteristic of an intrinsic semiconductor material?

It is chemically very pure and possesses poor conductivity Signup and view all the answers

What is the purpose of covalent bonding in a silicon crystal?

To strengthen the bonding arrangement between atoms Signup and view all the answers

According to the Bohr model, what is the electric charge of an electron?

1.602 x10^-19 C Signup and view all the answers

What is the atomic number of an element if its atom contains 20 protons?

20 Signup and view all the answers

How many electrons can the outermost shell of an atom hold, according to the information given?

8 Signup and view all the answers

Which particles in Bohr's model determine the element's chemical properties?

Protons Signup and view all the answers

Considering the given information, which property makes an atom stable?

Having a fully filled outermost shell Signup and view all the answers

What is the electric charge of a proton?

Positively charged with the same magnitude as an electron Signup and view all the answers