Chapter 9

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Across
  1. 3. The average mass of the naturally occurring isotopes of an element.
  2. 6. The number of protons in an element.
  3. 10. An electron in the outermost energy level of an atom.
Down
  1. 1. An atom that carries an electrical charge.
  2. 2. Equal to the number of protons plus neutrons.
  3. 4. Two atoms with different numbers of neutrons.
  4. 5. Any of the possible energies an electron may have in an atom.
  5. 7. Large and heavy like protons, but have no electrical charge located in the nucleus.
  6. 8. Tiny, very light particles that move outside the nucleus with a negative charge.
  7. 9. Larger than electrons located in the nucleus with a positive charge.