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5 Written questions

5 Matching questions

  1. Chemistry
  2. radioactive isotopes (radioisotopes)
  3. atoms
  4. tracers
  5. mass number
  1. a Unstable isotopes; their nuclei decay into a stable configuration over time, emitting radiation as they do so, and transform into a different element; the time span of the change is anywhere from a fraction of a second to millions of years, depending on the isotope.
  2. b The sum of an atom's protons and neutrons.
  3. c The science of the structure and interactions of matter.
  4. d The smallest units of matter that retain the properties and characteristics of the elements.
  5. e Radioisotopes used to follow movements of certain substances through the body.

5 Multiple choice questions

  1. The average mass of all of an atom's naturally occurring isotopes.
  2. The dense central core of an atom where protons and neutrons are located.
  3. The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
  4. The regions outside the nucleus that electrons move about in; depicted as simple circles around the nucleus; each region holds a specific number of electrons (2.8.18).
  5. The time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.

5 True/False questions

  1. molecular formulaTwo or more atoms sharing electrons.


  2. major elementsCarbon, Hydrogen, Oxygen, and Nitrogen; they alone make up about 96% of the body's mass.


  3. Calcium, Phosphorous, Sulfur, Potassium, Sodium, Chlorine, Magnesium, and IronThe four major elements in the human body.


  4. neutrons (n⁰)Uncharged (neutral) particles located within the nucleus of an atom.


  5. isotopesThe smallest units of matter that retain the properties and characteristics of the elements.


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