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5 Written questions

5 Matching questions

  1. chemical elements
  2. antioxidants
  3. radioactive isotopes (radioisotopes)
  4. electrons (e⁻)
  5. lesser elements
  1. a Negatively charged particles located in a cloud, moving about the nucleus of an atom.
  2. b Calcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.
  3. c 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.
  4. d Substances that inactivate oxygen-derived free radicals.
  5. e The building blocks of all forms of matter -- both living and nonliving; cannot be split into a simpler substance by ordinary chemical means.

5 Multiple choice questions

  1. Radioisotopes used to follow movements of certain substances through the body.
  2. The sum of an atom's protons and neutrons.
  3. Carbon, Hydrogen, Oxygen, and Nitrogen; they alone make up about 96% of the body's mass.
  4. 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.
  5. The average mass of all of an atom's naturally occurring isotopes.

5 True/False questions

  1. ionAn atom that has a positive or negative charge because it has unequal numbers of protons and electrons.


  2. dalton (atomic mass unit)The standardized unit of measurement for the mass of atoms and their subatomic particles.


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


  4. electron shellsNegatively charged particles located in a cloud, moving about the nucleus of an atom.


  5. chemical symbolOne or two letters of an element's name in English, Latin, or another language (ex. H for Hydrogen, Ne for Neon, or K for Potassium).