Across
- 5. The chemical symbol He
- 6. One or two letters used to represent an element
- 8. The chemical symbol Mg
- 12. A single substance without anything mixed in
- 13. Easily broken
- 14. An attractive force that holds two atoms together
- 18. The number by which elements are ordered in the periodic table
- 19. A repeating arrangement of atoms in a solid
- 21. A column in the periodic table
Down
- 1. C6H12O6
- 2. An element that typically does not conduct heat or electricity
- 3. A group of atoms bonded together
- 4. The chemical symbol Cl
- 7. A substance made up of two or more types of atom bonded together
- 9. A shiny element that conducts heat and electricity
- 10. The re-arrangement of atoms to form one or more new substances
- 11. A grid arrangement of all known chemical elements
- 15. A substance made up of only one type of atom
- 16. The temperature at which a substance changes from liquid to gas
- 17. The temperature at which a substance changes from solid to liquid
- 20. The chemical symbol Na