unit 1 key terms: atomic structure

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Across
  1. 4. one polarity of a voltage, current, or charge
  2. 6. the smallest part of a compound that is made of individual atoms
  3. 10. it reverses direction of flow at regular intervals
  4. 12. the shell in which an electron moves around the nucleus of an atom
  5. 14. same number of protons in the nucleus
  6. 15. positive charge
  7. 16. bidirectional electric source
  8. 18. made from a combination of atoms
  9. 19. the force that causes one object to push another object away from itself
  10. 21. permit electrons to flow through them easily
  11. 22. substance that can't be chemically divided into 2 or more simpler substances
Down
  1. 1. electric charge developed when an object contains more protons than electrons
  2. 2. no charge
  3. 3. a material used to electrically isolate two conductive surfaces
  4. 5. basic building block of the universe
  5. 7. only flows in one direction
  6. 8. any electrons located on the outer shell of an atom
  7. 9. a material that contains four valence electrons and is used in the production of solid-state devices
  8. 11. unidirectional electric source
  9. 13. the force that causes one object to pull another object to itself
  10. 17. negative charge
  11. 20. the center or middle of an atom