Chemistry

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Across
  1. 1. vertical columns on periodic table
  2. 3. positively charged ion
  3. 5. element with one proton
  4. 6. atoms with different number of neutrons (same element and number of protons)
  5. 7. negatively charged ion
  6. 8. electrons orbit around
Down
  1. 2. horizontal rows of the periodic table
  2. 4. alkali metal
  3. 5. noble gas
  4. 6. atom gains or loses electrons