Across
- 4. Lightest and most abundant element (8)
- 5. Bond formed by electron sharing (8)
- 9. Element essential for bones and teeth (7)
- 10. Scientist who proposed the atomic theory (6)
- 12. Positively charged particle in an atom (6)
- 14. Type of reaction that absorbs energy (11)
Down
- 1. Speed at which a reaction occurs (8)
- 2. Table (Table that organizes all elements (8)
- 3. Measure of acidity or basicity (2)
- 6. Process of a solid turning into a gas (11)
- 7. Negatively charged particle in an atom (8)
- 8. Symbol for gold (Au)
- 11. Symbol for sodium (2)
- 13. Gas essential for respiration (6)