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The Nucleus of the Atom Quiz #1
  • 1. The text's authors use the term "incredible emptiness" to explain:
A) The vast distance between atoms in the vacuum of outer space.
B) The vast distance between the neutrons and protons of the nucleus of an atom.
C) The vast distance between the nucleus of an atom and its orbiting electrons.
D) none of the answers are correct.
  • 2. Albert Einstein's equation E=mc2 tells us that:
A) a very small mass is equal to a very large amount of energy.
B) a lot of mass contains only a little energy.
C) mass can move faster than the speed of light.
D) mass does not determine the energy in most matter.
  • 3. In the chemical equation 2H2 + O2 -->2H2O the mass of the H2O molecule is slightly less than the masses of the H2 and O2 because:
A) ions are formed.
B) not all of the atoms are used.
C) the molecules of water lose neutrons.
D) some of the mass is converted to the binding energy of the bond.
  • 4. Which of these best explains the relationship of a proton and a neutron.
A) Protons are positive, neutrons have no charge, and their masses are almost the same.
B) Neutrons are negative with much larger mass; protons are positive with a smaller mass.
C) Neutrons are negative with smaller mass; protons are positive and much larger.
D) Protons are negative, neutrons are positive, and their mass is almost the same.
  • 5. Which of these statements best describes the relationship between parts of an atom and the atom's size and mass.
A) The nucleus gives the atom its mass but electrons give the atom its size.
B) The nucleus gives the atom its size and electrons give the atom its mass.
C) Protons, neutrons and electrons all contribute to both the size of an atom and an atom's mass.
D) None of the answers are correct.
  • 6. An element can be named if you know this:
A) Mass number.
B) Atomic number.
C) Number of electrons.
D) None of the answers are correct.
  • 7. What determines the atomic number of an atom?
A) The number of electrons in orbit around the nucleus.
B) The number of neutrons in its nucleus.
C) The number of electrons plus the number of protons, divided by 2.
D) The number of protons in its nucleus.
  • 8. Two atoms are said to be Isotopes of each other if:
A) They have the same number of protons and neutrons but different atomic masses.
B) They have the same atomic mass but different atomic numbers.
C) They have the same number of electrons but different number of protons.
D) They have the same atomic number but different atomic masses.
  • 9. The mass number of an atom is approximately:
A) The number of protons in an atom multiplied by 2.
B) The number of neutrons plus the number of electron in the atom.
C) The number of neutrons and protons, minus the number of electrons in an atom.
D) None of the answers are correct.
  • 10. Carbon's atomic number is 6. Determine how many neutrons Carbon-14 has.
A) 6
B) 2
C) 8
D) 22
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