Across
- 1. element with symbol Si
- 5. makes balloons float in air
- 6. element with symbol Pb
- 9. most abundant gas on Earth
- 10. element with symbol Mg
- 11. very heavy metal used for fishing sinkers
- 12. most reactive metal
Down
- 2. used to keep swimming pool hygiene
- 3. we need this gas for our survival
- 4. least reactive metal
- 5. burns with squeaky pop
- 7. light metal used in kitchen foil
- 8. gas used in colorful signs