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