Periodic Table Crossword

123456
Across
  1. 2. a positively charged ion
  2. 4. a negatively charged ion
  3. 5. First person to publish a completed periodic table
  4. 6. Group 1 on the periodic table
Down
  1. 1. Found in the earth's crust
  2. 3. Only group on the periodic table to have all three phases of matter