Across
- 2. a substance made up of one atom
- 5. a repeating arrangement of molecules bonded together
- 6. the smallest part of an element
- 8. the letters used to show a element
- 9. tending to chemically react with other puresubstances
- 10. the way in which the elements are ordered on the periodic table
- 13. a substance made up of one or more atoms
- 15. easily broken
Down
- 1. a source where you can recognize your elements
- 3. a substance with nothing mixed into it
- 4. what you put in balloons
- 7. the point when a liquid changes from liquid to a gas
- 11. a shiny element that conducts electricity and heat
- 12. a column in the periodic table
- 14. a force that holds two atoms together