Across
- 5. small number in a chemical formula that indicated the number of atoms of that element
- 6. horizontal row on the periodic table
- 11. electron found in the outermost energy level
- 12. subatomic particle with a negative charge
- 13. type of element found on the left side of the zig zag line on the periodic table
- 14. substance made of only one type of atom
- 16. substance made of two or more types of atoms that are chemically attached
- 17. reaction that gives off heat
- 19. property that can be observed without changing the identity of the substance
- 20. subatomic particle that creates chemical bonds
- 22. "ring" where electrons are likely to be found
- 23. type of element touching the zig zag line of the periodic table
- 24. reaction that absorbs heat
Down
- 1. vertical column on the periodic table
- 2. state of matter with the highest kinetic energy
- 3. substance created in a chemical reaction
- 4. property that is observed when a substance changes into something new
- 7. element with 17 protons
- 8. change from a gas to a liquid
- 9. number of energy levels in an atom of uranium
- 10. large number in front of a chemical formula
- 15. substance with two more things that are not chemically attached
- 18. number of valence electrons in helium
- 19. subatomic particle in the nucleus with a positive charge
- 21. substance at the start of a chemical reaction