Atomic Theory

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Across
  1. 2. : Number of protons in an atom
  2. 7. : Center of the atom
  3. 10. : Particle with a positive charge
  4. 11. : Combination of two or more substances not chemically bonded
  5. 12. : The total number of protons and neutrons
  6. 13. : The force that holds atoms together
  7. 15. : Negatively charged particle
Down
  1. 1. : Smallest unit of matter
  2. 3. : Group of atoms bonded together
  3. 4. : A pure substance that cannot be broken down further
  4. 5. : Table that organizes elements
  5. 6. : Atoms with the same number of protons but different neutrons
  6. 8. : Substance made of two or more elements chemically combined
  7. 9. : Neutral particle in the nucleus
  8. 14. : Charged atom that has gained or lost electrons