Unit 2 Vocabularry

123456789101112131415161718192021
Across
  1. 3. discovered the electron
  2. 6. developed the concept of indivisible matter
  3. 8. are at the center of the atom
  4. 11. created the modern day periodic table
  5. 13. discovered by J.J. Thomson by using the cathode ray tube
  6. 15. elements that have the same number of protons but different number of neutrons
  7. 17. figured out that electrons travel in specific orbits
  8. 19. states that electrons are particles that move like waves
  9. 20. made the uncertain theory
  10. 21. positive charge subatomic particles inside the nucleus
Down
  1. 1. discovered the quantum action
  2. 2. equals the same number of protons
  3. 4. was discovered by Chadwick
  4. 5. Model was develop by J.J Thomson
  5. 7. is the time that takes for half of any sample to decay
  6. 9. discovered the charge of an electron
  7. 10. Dalton imagine them as solid, hard spheres
  8. 12. Experiment Rutherford used Alpha particles in this experiment
  9. 14. smallest unit of matter
  10. 16. develop the modern atomic theory
  11. 18. created a famous experiment called Gold Foil