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5 Written Questions

5 Matching Questions

  1. isotopes
  2. subatomic particles
  3. Carbon, Hydrogen, Oxygen, and Nitrogen
  4. ion
  5. mass
  1. a 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. b The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
  3. c The four major elements in the human body.
  4. d The amount of matter in any object; never changes.
  5. e An atom that has a positive or negative charge because it has unequal numbers of protons and electrons.

5 Multiple Choice Questions

  1. The smallest units of matter that retain the properties and characteristics of the elements.
  2. The average mass of all of an atom's naturally occurring isotopes.
  3. One 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. 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 process of giving up or gaining electrons.

5 True/False Questions

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


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


  3. half-lifeThe time required for half of the radioactive atoms in a sample of an isotope to decay into a more stable form.


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


  5. free radicalRadioisotopes used to follow movements of certain substances through the body.


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