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 (A)</p> Signup and view all the answers

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

<p>Electrons (A)</p> Signup and view all the answers

Which type of bond involves the exchange of valence electrons?

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

In which electron shell are valence electrons located?

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

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

<p>Potassium (A)</p> Signup and view all the answers

What are the properties of an ionic bond?

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

In covalent bonding, what happens to the outer electrons?

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

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