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5 Written Questions

5 Matching Questions

  1. subatomic particles
  2. electron shells
  3. molecule
  4. half-life
  5. mass
  1. a The time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.
  2. b 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).
  3. c The amount of matter in any object; never changes.
  4. d Two or more atoms sharing electrons.
  5. e The dozens of particles that compose atoms, namely protons, neutrons, and electrons.

5 Multiple Choice Questions

  1. Atoms of an element that have different numbers of neutrons and therefore different mass numbers; most of them are stable and do not change over time.
  2. The average mass of all of an atom's naturally occurring isotopes.
  3. 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. The number of protons in an atom.
  5. The process of giving up or gaining electrons.

5 True/False Questions

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


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


  3. 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).


  4. antioxidantsThe smallest units of matter that retain the properties and characteristics of the elements.


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


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