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