Atomic Theory

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Across
  1. 3. another particle that exists in the nucleus of atoms that has no electric charge.
  2. 6. are negatively charged particles that are a part of an atoms model
  3. 7. The sum of the protons and neutrons in the atom
  4. 9. a series of models that grew based on evidence from many experiments that have taken place over time.
Down
  1. 1. a positively-charged particle in an atom's nucleus.
  2. 2. The number of protons in an atoms nucleus is the atomic number of that atom's element.
  3. 4. A dense positive charge in the center of an atom.
  4. 5. Atoms with the same number of protons and different number of neutrons.
  5. 8. is the smallest particle that still can be considered an element