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5 Written Questions

5 Matching Questions

  1. mass number
  2. neutrons (n⁰)
  3. compound
  4. electron shells
  5. atoms
  1. a The smallest units of matter that retain the properties and characteristics of the elements.
  2. b The sum of an atom's protons and neutrons.
  3. c Uncharged (neutral) particles located within the nucleus of an atom.
  4. d 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. e A substance that contains atoms of two or more different elements.

5 Multiple Choice Questions

  1. Two or more atoms sharing electrons.
  2. The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
  3. The average mass of all of an atom's naturally occurring isotopes.
  4. 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.
  5. The science of the structure and interactions of matter.

5 True/False Questions

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


  2. atomic numberThe sum of an atom's protons and neutrons.


  3. protons (p⁺)Positively charged particles located within the nucleus of an atom.


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


  5. matterAnything that occupies space and has mass.


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