Luke Strayer Burkholder CH9

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Across
  1. 3. Large and heavy like protons and no electrical charge.
  2. 6. Number of protons.
  3. 8. Any of the possible energies an electron may have in an atom.
  4. 10. Equal to the number of protons plus neutrons.
Down
  1. 1. Much larger and heavier than electrons and a positive charge.
  2. 2. Average mass of the naturally occurring isotopes of an element.
  3. 4. An electron in the outermost energy level of an atom.
  4. 5. Two atoms with different numbers of neutrons are called.
  5. 7. Tiny very light particles.
  6. 9. An atom that carries an electrical charge is called an.