Periodic Table
Across
- 4. a particle which is neutral in the atom
- 7. Models Show the atomic structure of an atom
- 8. number used to tell the number of protons in an element
- 10. Vertical columns on the periodic table
- 12. broken down into regions of space and is negatively charged
- 15. A particle in the nucleus that is positively charged
- 16. Located on the left of metalloids
- 17. Uses symbols to show the number of atoms of each element
- 19. was the first to develop a periodic table that was organized by atomic mass
- 20. Elements in group 17 fall under this category
Down
- 1. discovered that the number of protons is unique to each of the elements
- 2. an element that can make up coal and methane gas
- 3. Was the first to name the atom
- 5. are poor conductors and are gases
- 6. what element is used to get bacteria out of pools
- 9. Made up of protons and neutrons and is where the mass is located
- 11. are solids and have physical properties
- 13. the force between the nucleus and electron cloud
- 14. element that is common in food
- 18. Horizontal rows on the periodic