Across
- 3. opposite of metals
- 4. horizontal row
- 5. Most stable and unreactive elements
- 8. the mass of one atom of an element
- 11. react when exposed to air and water
- 13. the sum of protons and neutrons in an atom
- 15. appearance or state may be altered
- 18. neutral particles
- 19. sodium chloride
- 22. have both metallic and non-metallic properties
- 23. vertical column
Down
- 1. Anything that has mass and occupies space
- 2. most reactive of the metals
- 4. made only one kind of matter
- 6. Workplace hazardous materials information system
- 7. formation of a different substance(s)
- 9. red octagon
- 10. NaCl
- 12. yellow triangle
- 14. Most reactive non-metals
- 16. positively charged particles
- 17. orange diamond
- 20. characteristics that describe a substance
- 21. shiny, malleable and ductile
- 22. a combination of pure substances