Science

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Across
  1. 1. unable to cut
  2. 4. defines each element
  3. 7. smallest particle
  4. 8. form of chemical bonding
  5. 10. bonded atoms
  6. 11. initial atomic theory
  7. 12. found in nucleus
Down
  1. 2. protons plus neutrons
  2. 3. smaller mass than neutrons and protons
  3. 5. negative charge
  4. 6. bonding between non-metal and a metal atom
  5. 8. two or more different types of atoms
  6. 9. electrons determine atom stability or reactivity