Across
- 4. the number of protons in an atom
- 6. containing only one kind of atom
- 7. 75% of the PT are these
- 11. the right side of the PT
- 13. stable gases
- 14. the number of protons and neutrons
- 16. an organizational chart of elements
Down
- 1. the father of the modern periodic table
- 2. create beautiful colors
- 3. a column in the periodic table
- 5. a way to represent valence electrons
- 8. an atom with a different number of neutrons
- 9. middle of the PT transition
- 10. slaty elements
- 12. smoke detectors
- 15. a row in the Periodic Table