Chapter 9-Claire

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Across
  1. 4. An atom that carries an electrical charge.
  2. 5. Two atoms with differnet numbers of neutrons.
  3. 7. Tiny, very light particles that move around the outside of the nucles.
  4. 8. An electron in the outermost energy level of an atom.
  5. 9. Large and heavy have no electrical charge.
  6. 10. Large and heavy located in the nucleus of the atom.
Down
  1. 1. number of protons.
  2. 2. equal to the number of protons plus neutrons.
  3. 3. Any of the possible energies an electron may have in an atom.
  4. 6. Average mass of the naturally occurring isotopes of an element.