Across
- 2. a bunch of atoms that are bonded together
- 5. elements with an atomic number over 94 are called _______ elements
- 6. what type of bond is the shaving of electron pairs between atoms
- 9. exist in shells, or energy levels around the nucleus
- 10. chemicals that change colours when added to an acid or base
- 12. What does the element K represent?
- 13. poor conductors of electricity
- 15. the substances produced at the end of the reaction
- 16. Group 18, Period 3
- 17. two or more substances combine to produce a single new substance
- 18. the substances that go into a chemical reaction
- 20. level 2 of radioactivity is called what?
Down
- 1. a single compound breaks down into two or more simpler products
- 3. produce toxic coloured vapours
- 4. rows are called what on the period table
- 7. Reactions occur when an acid is added to a base
- 8. columns are called what on the periodic table?
- 11. The burning of a substance in oxygen
- 14. 7.5 pH level
- 19. shiny, soft and extremely reactive metals