Science

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Across
  1. 2. number of protons plus neutrons
  2. 4. smallest chemical particle
  3. 5. chemical bonding between non-metal and metal atom
  4. 7. most active electrons
  5. 10. negative ion
  6. 11. initial atomic theory
  7. 13. unable to be cut
  8. 14. molecule with 2 or more different types of atoms
Down
  1. 1. arranges elements based on their properties
  2. 3. found in the nucleus
  3. 5. when nucleus loses or gains a neutron
  4. 6. positive ion
  5. 8. measure of an atom or a molecule
  6. 9. smaller than neutrons and protons
  7. 12. number of protons