Across
- 1. Scale used to measure acidity or alkalinity
- 3. The smallest unit of an element
- 5. A substance made of two or more elements chemically bonded together
- 7. Element with atomic number 1
- 10. Bond formed by the sharing of electrons
- 11. Substances that donate protons
- 14. Vertical columns on the periodic table
- 15. A negatively charged particle
- 16. Substances that accept protons
Down
- 1. A positively charged particle
- 2. Substance that increases the rate of a reaction without being consumed
- 4. Elements in Group 18
- 6. Number of protons in the nucleus of an atom
- 8. Bond formed by the transfer of electrons
- 9. A neutral particle in the nucleus of an atom
- 12. The central part of an atom
- 13. Horizontal rows on the periodic table