Across
- 2. Matter that contains more than one type of particle
- 5. Positively charged particle
- 6. Positively charged centre of an atom
- 9. Outermost electron
- 11. Ability of a substance to remain unchanged
- 12. Made of two or more different elements
- 16. Anything that occupies space
- 17. Element that shares some properties with metals and non-metals
- 19. A pure substance
- 20. Positively or negatively charged atom
Down
- 1. Uncharged particle
- 3. Column in the periodic table
- 4. Smallest particle of a pure substance
- 7. Negatively charged particle
- 8. Ability to burn in air
- 10. Number of protons in the nucleus
- 13. Row in the periodic table
- 14. Measure of a substance's resistance to flow
- 15. Smallest part of an element
- 17. Element that is hard, shiny, malleable, and ductile
- 18. Ratio of mass to volume