Across
- 4. Generally, the force that exists between two objects that contain opposite electrical charges.
- 5. A material, the smallest part of which would be an atom.
- 7. Any material composed of atoms.
- 10. Materials that conduct electricity easily.
- 13. Current that reverses its direction of flow at periodic intervals.
- 14. The center or core of an object.
- 18. Materials that hinder the flow of electricity.
- 19. Something that moves in only one direction.
- 20. A sub-atomic particle located in the nucleus of an atom; this has a positive charge.
- 21. The space in which an electron circles the nucleus of an atom.
Down
- 1. One of the principal parts of an atom. This has no charge and it is part of the nucleus.
- 2. The number of protons located in the nucleus of an atom.
- 3. A charge formed by an excess of electrons.
- 6. A device that can conduct current in either direction, or current that flows in two directions.
- 8. Electrons located in the outermost orbit or shell of an atom.
- 9. Current that flows in only one direction.
- 11. A sub-atomic particle that orbits the nucleus of an atom and contains a negative charge.
- 12. Generally, the force that exists between two objects that contain like electrical charges.
- 15. A combination of atoms that form the smallest part of an atom.
- 16. The smallest part of an element, this is composed of three primary sub-atomic particles; the proton, the neutron, and the electron.
- 17. A charge formed by a lack of electrons.