Across
- 1. the first element to be isolated by electrolysis
- 4. Most reactive electronegative element
- 7. the most naturally resistant to corrosion
- 8. used in lightening and lasers
Down
- 2. the most accurate atomic clock uses this element
- 3. very good disinfectant
- 5. Best conductor for heat and electricity
- 6. Makes up 78% of Earth's atmosphere