Across
- 3. It is in a class by itself
- 7. It decreases as you move down a group.
- 15. Elements created by men.
- 17. Here we can find nuclear reactions today.
- 18. Original explosion of the universe according to theories.
- 19. Most unreactive group
- 20. It is formed when you mix metals.
Down
- 1. One of the basic 6 elements
- 2. Particle accelerator for superheavy elements.
- 4. One synthetic element named after a prize.
- 5. When a star dies.
- 6. Most elements are __________
- 8. Early chemists tried to perfom this nuclear reaction.
- 9. They react with water to form alkaline solutions.
- 10. Energy requiered to remove an electron
- 11. Atomic radius _______ as you move down a group.
- 12. These are revealed by the arrangement of the periodic table
- 13. All are radioactive
- 14. Another name for group 17
- 16. Symbol of one element found in the spectra of stars