Across
- 3. chemical combination of two or more elements in a specific ratio
- 4. a substance that helps a chemical reaction that proceed more quickly
- 7. group 18 on the periodic table
- 8. substance made of only one kind of matter
- 9. an organic catalyst
- 12. most reactive non meta
- 14. a chemical that releases heat
- 16. positively charged particle
- 17. a combination of symbols that represent a compound
- 18. a reaction that takes place when two or more substances react to make a new substance
- 22. negatively charged particle
- 23. atomic number 8 on the periodic table
- 24. the horizontal column on the periodic table
- 25. an atom that has been electrically charged
Down
- 1. an element with both metal and non metal properties
- 2. most stable and nonreactive elements
- 5. the result of a chemical reaction when a new substance is formed
- 6. vertical column of elements on the periodic table
- 10. two nonmetals combined
- 11. slow chemical change that occurs when oxygen in the air reacts with metals
- 13. how many protons are in the nucleus
- 15. neutral
- 19. a chemical reaction that absorbs energy
- 20. two metals combined
- 21. a solution in which water is the solvent