REVISING CHEMISTRY

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Across
  1. 4. Solid sphere model
  2. 7. Father of modern chemistry
  3. 9. Proposed a theory for the hydrogen atom based on quantum theory
  4. 10. The first to think of the atom
  5. 12. ___ number is the number of protons plus neutrons
  6. 13. atom or group of atoms with electric charge
  7. 14. She won two Nobel prizes
  8. 15. atom or group of atoms with negative charge
  9. 16. _____number is the number of protons
  10. 18. the simplest element
  11. 19. Emission of ionizing radiation or particles
Down
  1. 1. non-metal solids are ___ and fragile
  2. 2. Plum pudding model
  3. 3. She was part of a team that discovered nuclear fission
  4. 5. atom or group of atoms with positive charge
  5. 6. He stated the law of definite proportions
  6. 8. Planetary atomic model
  7. 11. ____ shell is the outermost shell of every element
  8. 16. The Group 1 elements are known as the ____ metals
  9. 17. He discovered neutrons