Highschool Chemistry Test

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Across
  1. 1. Table ordering all the known elements
  2. 6. Discovered the electron
  3. 12. Discovered that electrons orbit around the nucleus
  4. 15. Elements with a different number of neutrons
  5. 17. Groups 1,2 and 13-18
  6. 18. Electrons on the outermost energy shell
  7. 20. Average mass of an atom including all its isotopes
  8. 21. Neutrally charged particle
  9. 22. The Columns in the periodic table based off of number of electron shells
  10. 23. Number of electron shells
Down
  1. 2. Arrangement of Electrons in an atom
  2. 3. The rows in the periodic table based on how many valence electrons something has
  3. 4. How well something conducts electricity/temperature
  4. 5. Elements like Lanthanum
  5. 7. Made the modern periodic table
  6. 8. Number of protons in an atom
  7. 9. Positively charged particle
  8. 10. Hard but prone to shattering/breaking
  9. 11. An atomic model is based off of this food
  10. 13. Negatively charged particle
  11. 14. a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
  12. 16. THE BEST SCIENCE TEACHER!!!
  13. 17. Who discovered the nucleus
  14. 19. Elements like Actinium
  15. 20. The basic unit of an element