Quantum Mechanics of Electron Orbits
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Questions and Answers

What was the primary material used during the Stone Age?

  • Stone (correct)
  • Copper
  • Iron
  • Steel
  • Approximately what year did the use of iron and steel begin?

  • 1000 BC
  • 1500 BC
  • 2000 BC
  • 1200 BC (correct)
  • What scientific understanding enabled the development of Materials Science?

  • Classical Mechanics
  • Electromagnetism
  • Thermodynamics
  • Quantum Mechanics (correct)
  • What is the focus of Materials Science?

    <p>The relationship between material properties and microstructure</p> Signup and view all the answers

    When was the discovery of a cheap process to make steel made?

    <p>1850</p> Signup and view all the answers

    What is the combination of physics, chemistry, and the focus on material properties and microstructure known as?

    <p>Materials Science</p> Signup and view all the answers

    What is the nature of the orbits of electrons in an atom according to quantum mechanics?

    <p>Fuzzy orbits with a probability of finding them at certain distances</p> Signup and view all the answers

    What is the significance of the principal quantum number n in atomic orbitals?

    <p>It determines the size of the orbital</p> Signup and view all the answers

    What is the Pauli exclusion principle in atomic structure?

    <p>Only two electrons can occupy an orbit with a given n, l, m</p> Signup and view all the answers

    What is the characteristic of the noble gases in the periodic table?

    <p>They have closed shells and do not gain or lose electrons</p> Signup and view all the answers

    What is the term for the ability of an atom to gain or lose electrons to form a closed shell?

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

    What is the result of the formation of a closed shell in molecules?

    <p>The formation of a molecular shell</p> Signup and view all the answers

    What is the primary reason why metals have high electrical and thermal conductivity?

    <p>Electrons move freely from one atom to another</p> Signup and view all the answers

    Which of the following elements is not a metalloid?

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

    What is the primary characteristic of the noble gases?

    <p>They have a fully filled outermost orbital</p> Signup and view all the answers

    What is the general trend for the light metals in the periodic table?

    <p>They are soft and chemically reactive</p> Signup and view all the answers

    What is the significance of the atomic number in the periodic table?

    <p>It determines the number of protons in an atom</p> Signup and view all the answers

    Which element is an exception to the general rule that metals are solid at room temperature?

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

    What is the primary mechanism behind the formation of an ionic bond?

    <p>Transfer of electrons from one atom to another</p> Signup and view all the answers

    What is the characteristic of ionic bonds in terms of directionality?

    <p>Non-directional</p> Signup and view all the answers

    In an ionic bond, which of the following is responsible for the attraction between the oppositely charged ions?

    <p>Electrostatic attraction</p> Signup and view all the answers

    What is the purpose of the fractional ionic bonding formula?

    <p>To quantify the degree of ionic character in a bond</p> Signup and view all the answers

    Why do positive and negative ions alternate in a symmetrical fashion in an ionic solid?

    <p>To preserve the charge neutrality</p> Signup and view all the answers

    What is the typical combination of bonding in real solids?

    <p>Ionic bonding combined with covalent bonding</p> Signup and view all the answers

    What is the force that holds ions together, according to the given formula?

    <p>Attractive force</p> Signup and view all the answers

    What is the primary reason for the formation of covalent bonds?

    <p>To achieve a complete outer electron shell</p> Signup and view all the answers

    What is the characteristic of a covalent bond?

    <p>It is directional</p> Signup and view all the answers

    What is the energy of a covalent bond represented by?

    <p>U = -A + Br^-n</p> Signup and view all the answers

    What type of elements typically form covalent bonds with each other?

    <p>Non-metallic elements</p> Signup and view all the answers

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