science

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