6a vocab

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Across
  1. 1. cloud region around nucleus
  2. 3. table an arrangement of elements in order of their atomic numbers
  3. 4. uncharged particles
  4. 6. number number of protons in a nucleus
  5. 7. number sum of the number of protons and neutrons in a nucleus
  6. 9. positively charged particles
Down
  1. 2. negatively charged particles
  2. 5. center of an atom
  3. 8. smallest particle in an element