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5 Written questions

5 Matching questions

  1. subatomic particles
  2. free radical
  3. mass number
  4. radioactive isotopes (radioisotopes)
  5. electrons (e⁻)
  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 An atom or group of atoms with an unpaired electron in the outermost shell; makes the atom unstable, highly reactive, and destructive to nearby molecules.
  3. c Negatively charged particles located in a cloud, moving about the nucleus of an atom.
  4. d The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
  5. e The sum of an atom's protons and neutrons.

5 Multiple choice questions

  1. The science of the structure and interactions of matter.
  2. The number of protons in an atom.
  3. 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).
  4. The building blocks of all forms of matter -- both living and nonliving; cannot be split into a simpler substance by ordinary chemical means.
  5. The process of giving up or gaining electrons.

5 True/False questions

  1. atomsThe smallest units of matter that retain the properties and characteristics of the elements.


  2. trace elementsCalcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.


  3. tracersRadioisotopes used to follow movements of certain substances through the body.


  4. lesser elementsThe elements that make up the last .4% of the mass of the body.


  5. antioxidantsSubstances that inactivate oxygen-derived free radicals.