Across
- 3. elements found between group II and III
- 5. positively charged ion
- 7. sum if protons and neutrons
- 9. found in group 7
- 12. most reactive halogen
- 13. has stable electron arrangement
- 15. active part of air
- 18. the only metal that exist in liquid form
- 19. forms an amphoteric oxide
- 20. bonding formed when electrons are transferred
Down
- 1. first noble gas in the periodic table
- 2. same as atomic number
- 4. bonding formed when electrons are shared
- 6. determined by number of occupied energy levels
- 8. bonding formed when electrons shared come from only one atom
- 10. atomic number 11
- 11. negatively charge ion
- 14. can be placed in group I or VII
- 16. determined by electrons in outermost energy level
- 17. subatomic particle with no charge