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5 Written Questions

5 Matching Questions

  1. molecular formula
  2. Calcium, Phosphorous, Sulfur, Potassium, Sodium, Chlorine, Magnesium, and Iron
  3. subatomic particles
  4. Carbon, Hydrogen, Oxygen, and Nitrogen
  5. isotopes
  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 four major elements in the human body.
  3. c The eight lesser elements in the human body.
  4. d The dozens of particles that compose atoms, namely protons, neutrons, and electrons.
  5. e Indicates the elements and the number of atoms of each element that make up a molecule.

5 Multiple Choice Questions

  1. Uncharged (neutral) particles located within the nucleus of an atom.
  2. Substances that inactivate oxygen-derived free radicals.
  3. Calcium, Phosphorous, Potassium, Sulfur, Sodium, Chlorine, Magnesium, and Iron; make up about 3.6% of the body's mass.
  4. The number of protons in an atom.
  5. Anything that occupies space and has mass.

5 True/False Questions

  1. radioactive isotopes (radioisotopes)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. atomic mass (atomic weight)The standardized unit of measurement for the mass of atoms and their subatomic particles.

          

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

          

  4. compoundTwo or more atoms sharing electrons.

          

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

          

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