science

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Across
  1. 8. model created by dalton where the atom is a solid sphere shape
  2. 10. model that has the nucleus in the middle and the electrons around it on rings
  3. 11. a neutral electrical charge
  4. 13. atom with an overall charge consisting of one element
  5. 14. a group of elements with an overall charge
  6. 15. right side of the stair step on the periodic table
  7. 17. equipment used by thomson to study electric discharges
  8. 18. number of protons in a element
  9. 19. basic unit of a chemical element
  10. 20. center part of the atom that contains protons and neutrons
Down
  1. 1. left side of the stair step on the periodic table
  2. 2. elements arranged horizontal on the periodic table
  3. 3. a positive electrical charge
  4. 4. number of protons plus the number of neutrons in an element
  5. 5. outer part of the atom where electrons are found
  6. 6. a negative electrical charge
  7. 7. table full of all the elements
  8. 9. atoms with the same protons but different neutrons
  9. 12. along the stair step on the periodic table
  10. 16. elements arranged in columns on the periodic table