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