Across
- 2. Ability to burn, produces ash.
- 4. Formation of a new substance.
- 5. Mass of protons and neutrons.
- 7. Made of one type of atom.
- 11. Negatively charged, in outer shell.
- 12. Different substances not chemically combined.
- 13. Horizontal rows, number of electron shells.
- 14. Neutral particle, in the nucleus.
Down
- 1. Vertical columns, same valence electrons.
- 3. Number of protons/electrons in an atom.
- 6. Observed by changing chemical identity.
- 8. Positively charged, in the nucleus.
- 9. Two or more atoms chemically bonded.
- 10. Different elements chemically bonded.