Chapter 2

Last Updated By Scott Diaz on 05/05/2012
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Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic mass of an oxygen atom?

Answer:
a)  A) exactly 8 grams
b)  B) exactly 8 daltons
c)  C) approximately 16 grams
d)  D) approximately 16 daltons
e)  E) 24 amu (atomic mass units)
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Related Quiz Content
  • Answered in Chapter 2
    ) The nucleus of a nitrogen atom contains 7 neutrons and 7 protons. Which of the following is a correct statement concerning nitrogen?
    a)A) The nitrogen atom has a mass number of approximately 7 daltons and an atomic mass of 14.
    b)B) The nitrogen atom has a mass number of approximately 14 daltons and an atomic mass of 7.
    c)C) The nitrogen atom has a mass number of 14 and an atomic mass of 7 grams.
    d)D) The nitrogen atom has a mass number of 7 and an atomic number of 14.
    e)E) The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.
    e)E) The nitrogen atom has a mass number of 14 and an atomic mass of approximately 14 daltons.
  • Answered in Chapter 2
    Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers of 92, 94, 95, 96, 97, 98, and 100. Therefore, which of the following can be true?
    a)A) Molybdenum atoms can have between 50 and 58 neutrons.
    b)B) The isotopes of molybdenum have different electron configurations.
    c)C) The isotopes of molybdenum can have between 50 and 58 protons.
    d)D) The isotopes of molybdenum have between 50 and 58 neutrons and have different electron configurations.
    e)E) The isotopes of molybdenum have between 50 and 58 protons and have different electron configurations.
    a)E) The isotopes of molybdenum have between 50 and 58 protons and have different electron configurations.
  • Answered in Chapter 2

    Carbon-12 is the most common isotope of carbon, and has an atomic mass of 12 daltons. A mole of carbon in naturally occurring coal, however, weighs slightly more than 12 grams. Why?


    a)11) A) The atomic mass does not include the mass of electrons.
    b)B) Some carbon atoms in nature have an extra proton.
    c)C) Some carbon atoms in nature have more neutrons.
    d)D) Some carbon atoms in nature have a different valence electron distribution.
    e)E) Some carbon atoms in nature have undergone radioactive decay.
    c)E) Some carbon atoms in nature have undergone radioactive decay.
  • Answered in Chapter 2
    Which of the following best describes the relationship between the atoms described below?
    Which of the following best describes the relationship between the atoms described below?
    a)A) They are isomers.
    b)B) They are polymers.
    c)C) They are isotopes.
    d)D) They contain 1 and 3 protons, respectively.
    e)E) They each contain 1 neutron.
    c)E) They each contain 1 neutron.
  • Answered in Chapter 2
    The precise weight of a mole of some pure elements like silicon (Si) can vary slightly from the standard atomic mass, or even from sample to sample. Why?
    a)A) The element may undergo radioactive decay.
    b)B) The element may react with itself and gain or lose subatomic particles.
    c)C) The atoms of the element form chemical bonds with each other, and that changes the weight of the element.
    d)D) The element may have multiple stable isotopes, and the isotopic composition may vary from sample to sample.
    e)E) The amount of energy absorbed by the element affects the mass of its electrons, and thus the atomic mass can vary slightly.
    d)E) The amount of energy absorbed by the element affects the mass of its electrons, and thus the atomic mass can vary slightly.
  • Answered in Chapter 2

    a)A) two more protons than carbon-12.
    b)B) two more electrons than carbon-12.
    c)C) two more neutrons than carbon-12.
    d)D) two more protons and two more neutrons than carbon-12.
    e)E) two more electrons and two more neutrons than carbon-12.
    c)E) two more electrons and two more neutrons than carbon-12.
  • Answered in Chapter 2

    15) An atom has 6 electrons in its outer shell. How many unpaired electrons does it have?


    a)A) 0
    b)B) 2
    c)C) 4
    d)D) 6
    e)E) 2 or 4
    b)E) 2 or 4
  • Answered in Chapter 2
    The atomic number of nitrogen is 7. Nitrogen-15 is heavier than nitrogen-14 because the atomic nucleus of nitrogen-15 contains how many neutrons?
    a)A) 6
    b)B) 7
    c)C) 8
    d)D) 12
    e)E) 14
    c)E) 14
  • Answered in Chapter 2

    Electrons exist only at fixed levels of potential energy. However, if an atom absorbs sufficient energy, a possible result is that


    a)17) A) an electron may move to an electron shell farther away from the nucleus.
    b)B) an electron may move to an electron shell closer to the nucleus.
    c)C) the atom may become a radioactive isotope.
    d)D) the atom would become a positively charged ion, or cation, and become a radioactive isotope.
    e)E) the atom would become a negatively charged ion, or anion.
    a)E) the atom would become a negatively charged ion, or anion.
  • Answered in Chapter 2
    The atomic number of neon is 10. Therefore, which of the following is most correct about an atom of neon?
    a)A) It has 8 electrons in its outer electron shell.
    b)B) It is inert.
    c)C) It has an atomic mass of 10 daltons.
    d)D) It has 8 electrons in its outer electron shell and it is inert.
    e)E) It has 8 electrons in its outer electron shell, it is inert, and it has an atomic mass of 10 daltons.
    d)E) It has 8 electrons in its outer electron shell, it is inert, and it has an atomic mass of 10 daltons.
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Free Quiz Question From Chapter 2
Question: Oxygen has an atomic number of 8 and a mass number of 16. Thus, what is the atomic mass of an oxygen atom?
Answer:
A) exactly 8 grams
B) exactly 8 daltons
C) approximately 16 grams
D) approximately 16 daltons
E) 24 amu (atomic mass units)