Autumn Kwiatkowski: Chapter 9

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Across
  1. 4. number equal to the number of protons and nuetrons
  2. 6. number of protons
  3. 7. larger, heavier atoms with positive charge and located in the nucleus
  4. 8. often used for things that are too small or too large to be observed or understood easily
  5. 9. any of the possible energies adn electron may have in an atom
  6. 11. created the commonly used model of an atom
Down
  1. 1. a type of electron in the outermost energy level of an atom
  2. 2. different number of nuetron than proton
  3. 3. large and heavy, have no electrical charge, located in the nucleus of an atom
  4. 5. different number of electron than proton
  5. 10. tiny, light particles that have a negative elctrical charge and move around the outside of the nucleus