Across
- 2. is an alkali metal located in the first group or column of the periodic table.
- 4. is a non-metal element that is a gas at room temperature.
- 5. chemical element, a low-melting metal of Group 12 of the periodic table.
- 7. is a lightweight silvery-white metal of main Group 13 of the periodic table.
Down
- 1. is a clean fuel that produces only water when consumed in a fuel cell.
- 3. is a colorless gaseous chemical element found in tiny amounts in the air and used in electric lights.
- 6. is a chemical element like hydrogen-oxygen lead or any of the others in the periodic table.
- 8. is a salt of hydriodic acid