The periodic table

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Across
  1. 4. least reactive group
  2. 5. positive charge
  3. 7. number of periods
  4. 9. number of protons in the nucleus of an atom
  5. 10. group 1
Down
  1. 1. a column
  2. 2. negative charge
  3. 3. a row
  4. 6. neutral charge
  5. 8. building blocks of the universe