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MECH390 Dr Jaber Abu Qudeiri Lecture 2: The Nature of Materials Quiz
10 Questions
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MECH390 Dr Jaber Abu Qudeiri Lecture 2: The Nature of Materials Quiz

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Questions and Answers

What is the basic structural unit of matter?

  • Nucleus
  • Electron
  • Atom (correct)
  • Molecule

    • How many known elements are there currently?

  • 92
  • 118 (correct)
  • 104
  • 86

    • What does the atomic number represent?

  • Number of electrons in the nucleus
  • Number of protons in the nucleus (correct)
  • Number of neutrons in the nucleus
  • Atomic weight of the element

    • What is the atomic weight?

    <p>Weight of one atom in a mole of the element</p> Signup and view all the answers

    What balances the positive charge of the nucleus in an atom?

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

    Which type of bond involves the exchange of valence electrons?

    <p>Ionic bond</p> Signup and view all the answers

    In which electron shell are valence electrons located?

    <p>Outer shell</p> Signup and view all the answers

    Which element readily gives up electrons to become a positive ion?

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

    What are the properties of an ionic bond?

    <p>Poor ductility, high electrical conductivity</p> Signup and view all the answers

    In covalent bonding, what happens to the outer electrons?

    <p>They are shared between atoms</p> Signup and view all the answers

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