Atomic Structure and Quantum Mechanics
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Questions and Answers

What is the role of electrons in an atom?

  • They are negatively charged and located outside the nucleus. (correct)
  • They move very slowly around the nucleus.
  • They are located in the nucleus and have a positive charge.
  • They have no charge and contribute to the atom's mass.

    • How does the atomic structure of metals typically differ from that of nonmetals?

  • Metals lack any electrons in their outer configurations.
  • Metals have a higher number of neutrons than nonmetals.
  • Metals have fewer protons compared to nonmetals.
  • Metals are usually good conductors of electricity due to their electron configuration. (correct)

    • What is primarily responsible for the organization of elements on the periodic table?

  • The atomic mass of the elements.
  • The number of neutrons in the nucleus.
  • The chemical properties of the elements only.
  • The number of protons and the electron configuration. (correct)

    • What describes a neutral atom?

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

    In quantum mechanics, what does the electron cloud model describe?

    <p>Electrons are found in regions of probability around the nucleus.</p> Signup and view all the answers

    What is the maximum number of electrons that can be held in the principal energy level n = 2?

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

    What describes the relationship between principal energy levels and their sublevels?

    <p>The number of sublevels in a principal energy level is equal to the value of n.</p> Signup and view all the answers

    Which statement correctly reflects Schröedinger's contributions to atomic theory?

    <p>He created equations that account for both particle and wave properties of electrons.</p> Signup and view all the answers

    What is indicated by the principal energy level value 'n'?

    <p>The distance of the electron from the nucleus.</p> Signup and view all the answers

    Which sublevels exist within the principal energy level n = 3?

    <p>s, p, and d</p> Signup and view all the answers

    How many atomic orbitals exist in the p subshell?

    <p>3</p> Signup and view all the answers

    Which of the following accurately describes the behavior of electrons according to quantum mechanics?

    <p>Electrons have a probability of being found in specific regions in space.</p> Signup and view all the answers

    What determines the energy level of an electron in an atom?

    <p>The value of n and its associated sublevels.</p> Signup and view all the answers

    What does the atomic number (Z) represent in an atom?

    <p>The number of protons</p> Signup and view all the answers

    How is the mass number (A) of an atom calculated?

    <p>Number of protons + number of neutrons</p> Signup and view all the answers

    Which of the following describes isotopes?

    <p>Atoms of the same element with different numbers of neutrons</p> Signup and view all the answers

    Which particle has a negligible mass compared to protons and neutrons?

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

    What is the mass of a neutron in grams?

    <p>$1.6726 imes 10^{-24}$</p> Signup and view all the answers

    Which of the following statements is true about atomic mass?

    <p>It is the average mass of all isotopes of an element</p> Signup and view all the answers

    What will be the number of neutrons in an atom with a mass number of 26 and an atomic number of 12?

    <p>14</p> Signup and view all the answers

    Which characteristic is NOT true for isotopes?

    <p>They contain different numbers of protons</p> Signup and view all the answers

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