Austin Marvin Chapter 9

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Across
  1. 4. Have a negative electrical charge (-).
  2. 6. have no electrical charge.
  3. 8. equal to the number of protons plus neutrons.
  4. 10. have a positive charge(+).
Down
  1. 1. an electron in the outermost energy level of an atom.
  2. 2. equals the number of protons.
  3. 3. are often used for things that are too small or too large to be observed or that are too difficult to be understood easily.
  4. 5. average mass of the naturally occurring isotopes of an element.
  5. 7. Type of model we use.
  6. 9. An atom that carries an electrical charge is called