PERIODIC TABLE

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Across
  1. 2. Negative ion
  2. 5. Alkali metal in the fourth period
  3. 8. The opposite to shiny
  4. 10. Vertical column
  5. 12. The outer shell of noble gases is ...
Down
  1. 1. Positive ion
  2. 3. He arranged the table in ascending order of Z
  3. 4. Alkaline earth metal in the fourth period
  4. 6. The only liquid metal
  5. 7. Halogen in the second period
  6. 9. Horizontal row
  7. 11. Nobel gas in the first period