Across
- 2. Group of very reactive non-metals
- 3. Scientist who proposed the Law of Octaves for organizing the elements
- 6. Scientist who introduced atomic triads
- 8. Two electrons shared between atoms is what kind of bond
- 10. Gas that is identified with a pop test
- 11. Discovered the neutron
- 12. Element with many allotropes
- 13. Compound added to propane tanks for detection of leaks
- 15. Yellow nonmetal that forms acidic solutions when burned
- 18. Number of valence electrons in oxygen
- 19. Proposed the first modern atomic theory
- 22. Speeds up a reaction
- 24. Term for electrons in the outermost shell
- 25. Most reactive metal
- 27. Creates a bright red flame test
- 30. Atoms of the same element with different masses
Down
- 1. Property increasing across a period from left to right
- 4. Strong solid made of covalent bonds throughout
- 5. Established existence of a positively charged nucleus
- 7. basic building blocks of material
- 8. More reactive than magnesium but less reactive than lithium
- 9. subatomic particles which participate in reactions
- 13. Can be used to isolate silicon from sand
- 14. Group of highly reactive metals
- 16. Element essential for combustion
- 17. Substance early experimenters attempted to create by transmutation
- 20. Term used by Democritus for indivisible particles
- 21. Horizontal rows in the periodic table
- 23. Discovered the electron
- 26. Elements with some qualities of metal and some qualities of non-metals
- 28. One of the four Greek elements
- 29. Bond formed by transfer of electrons