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