Across
- 5. the negatively charged particles in an atom
- 7. comprised of protons, electrons and neutrons
- 8. the energy level of an atom
- 9. a compound with 2 hydrogen atoms and 1 oxygen atom
- 11. elements with 7 electrons on their outer shell
- 13. a molecule made up of two or more different elements
- 14. the element that is present in banana
- 15. the element with the symbol Al
- 16. the total number of protons and neutrons in an atom
- 18. also known as proton number
- 19. anything that has mass and takes up space
Down
- 1. the scientist whose work resulted in the modern Periodic Table
- 2. the gases found in group 0 of the Periodic table
- 3. the element with the symbol Na
- 4. the horizontal rows of the Periodic Table
- 6. use in the treatment of water
- 7. the group 1 elements
- 10. a molecule with the same atoms
- 12. the element with the symbol Ca
- 17. movement of fluid particles