Across
- 2. organic Catalyst
- 4. most reactive non metal
- 7. this elements symbol is K
- 10. a new substance after a chemical change is called a...
- 12. a compound made of 1 non metal and 1 metal
- 14. a subatomic particle with a negative charge
- 15. Most reactive metal especially in air and water
- 16. this elements symbol is O
- 17. The horizontal category on the Periodic table (7 of them)
- 18. a chart that groups all the elements in the world
- 21. This elements symbol is H
- 22. the substances you combine to create a chemical change are called...
- 24. This elements symbol is Na
Down
- 1. often a liquid or gas at room temperature
- 3. The vertical category on the periodic table (18 of Them)
- 5. a cemical reaction that absorbs heat
- 6. a subatomic particle with no charge
- 8. a compound made of 2 non metals
- 9. The most stable and unreactive (gas)
- 11. the average mass of an element
- 13. in between a metal and non metal
- 17. a subatomic particle with a positive charge
- 19. the number that shows how many electrons and proton is in a element
- 20. a chemical reaction that releases heat
- 23. This elements symbol is Au