Atomic Structure Basics
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Questions and Answers

What is the charge of an electron?

  • Electrically neutral
  • Negative (correct)
  • Neutral
  • Positive

    • What is the charge of a proton?

  • Electrically neutral
  • Positive (correct)
  • Neutral
  • Negative

    • What is the atomic number of an element defined as?

  • The number of electrons in the nucleus
  • The number of neutrons in the nucleus
  • The number of protons in the nucleus (correct)
  • The sum of protons and neutrons in the nucleus

    • What is the relationship between the atomic number and the number of electrons in an electrically neutral atom?

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

    What defines the atomic mass of an atom?

    <p>Sum of protons and neutrons (D)</p> Signup and view all the answers

    What term is used to describe atoms of the same element with different atomic masses?

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

    In the established scale, how is 1 atomic mass unit (amu) defined?

    <p>As the atomic mass of carbon-12 (C)</p> Signup and view all the answers

    What relationship does A ≅ Z + N represent?

    <p>The sum of protons and neutrons in an atom (B)</p> Signup and view all the answers

    How many atoms or molecules are present in one mole of substance?

    <p>6.022 × 10²³ (C)</p> Signup and view all the answers

    Which equation relates atomic weight in amu per atom to grams per mole?

    <p>1 amu/atom = 1 g/mol (D)</p> Signup and view all the answers

    When is it convenient to use amu per atom or molecule for atomic weight?

    <p>When dealing with large numbers of atoms or molecules (D)</p> Signup and view all the answers

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