periodic table crossword.

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Across
  1. 2. the small positivley charged center of an atom
  2. 3. metals second left farthest on the periodic table
  3. 5. particles with an electric charge of 1+
  4. 6. particles with an electric charge of 1-
  5. 7. the elements in the middle of the periodic table
  6. 8. group farthest left on the periodic table
Down
  1. 1. electrically neutral particles in the nucleus without charge
  2. 4. Number of protons.