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5 Written Questions

5 Matching Questions

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

5 Multiple Choice Questions

  1. Indicates the elements and the number of atoms of each element that make up a molecule.
  2. Negatively charged particles located in a cloud, moving about the nucleus of an atom.
  3. The four major elements in the human body.
  4. The standardized unit of measurement for the mass of atoms and their subatomic particles.
  5. 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).

5 True/False Questions

  1. tracersThe smallest units of matter that retain the properties and characteristics of the elements.


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


  3. moleculeA substance that contains atoms of two or more different elements.


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


  5. nucleusThe dense central core of an atom where protons and neutrons are located.


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