Atoms, Molecules, and Ions

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Across
  1. 3. This scientist performed the Oil Drop Experiment
  2. 6. Negatively charged ion
  3. 7. Positively charged ion
  4. 8. This group of elements have high conductivity and are malleable
  5. 11. This type of radiation releases helium nuclei
  6. 12. Sum of the protons and electrons
  7. 16. This scientist came up with 5 postulates for atomic theory
  8. 18. Located in the nucleus with a charge of +1
  9. 19. This element has only 1 proton
  10. 20. This type of radiation is released in most nuclear reactions
  11. 21. First Woman to win the Nobel Prize
Down
  1. 1. Located in the nucleus with no charge
  2. 2. Located outside the nucleus with a charge of -1
  3. 4. This group of elements have very poor conductivity and are dull and brittle
  4. 5. The protons stay the same in these but the electrons vary
  5. 9. This type of radiation releases electrons
  6. 10. This scientist discovered the electron
  7. 13. This scientist performed the Gold Foil Experiment
  8. 14. Number of protons in an atom
  9. 15. When two or more atoms that are nonmetals combine together this is formed
  10. 17. This group on the periodic table includes Cl and Br