Basic Electronics: Introduction to Atoms and Atomic Structure Quiz
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Questions and Answers

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?

    <p>The covalent bonds break allowing electrons to escape</p> Signup and view all the answers

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

    <p>Enhances conductivity</p> Signup and view all the answers

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

    <p>Electrons in the conduction band and holes in the valence band</p> Signup and view all the answers

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

    <p>To dictate the nature of chemical reactions and electrical properties</p> Signup and view all the answers

    What do you call an atom with four valence electrons?

    <p>Tetravalent</p> Signup and view all the answers

    What is the characteristic of a balanced atom?

    <p>It has an equal number of protons and electrons</p> Signup and view all the answers

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

    <p>The atom becomes electrically neutral</p> Signup and view all the answers

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

    <p>Semiconductor</p> Signup and view all the answers

    How many valence electrons does Carbon have?

    <p>6</p> Signup and view all the answers

    What happens to some valence electrons in an intrinsic silicon crystal at room temperature?

    <p>They jump the gap from the valence band into the conduction band, becoming free electrons</p> Signup and view all the answers

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

    <p>Hole current</p> Signup and view all the answers

    What is the primary characteristic of an insulator?

    <p>It has no free charge carriers and is non-conductive</p> 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?

    <p>It recombines with a hole</p> Signup and view all the answers

    What occurs in an insulator when the temperature increases?

    <p>The bonds break and free electrons are generated</p> 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?

    <p>Because they are negative charge carriers</p> Signup and view all the answers

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

    <p>A hole</p> Signup and view all the answers

    What is unique about the bonding in a silicon crystal?

    <p>The bonding is strengthened by the sharing of valence electrons</p> Signup and view all the answers

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

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

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

    <p>With a little change in energy</p> Signup and view all the answers

    What is the characteristic of an intrinsic semiconductor material?

    <p>It is chemically very pure and possesses poor conductivity</p> Signup and view all the answers

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

    <p>To strengthen the bonding arrangement between atoms</p> Signup and view all the answers

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

    <p>1.602 x10^-19 C</p> Signup and view all the answers

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

    <p>20</p> Signup and view all the answers

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

    <p>8</p> Signup and view all the answers

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

    <p>Protons</p> Signup and view all the answers

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

    <p>Having a fully filled outermost shell</p> Signup and view all the answers

    What is the electric charge of a proton?

    <p>Positively charged with the same magnitude as an electron</p> Signup and view all the answers

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