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Across 2. protons and neutrons 4. allowing charges to move freely along a connection between a conductor and the gound 5. a material that has near infinite conductivity at low temperatures 8. positive charge 10. electricity at rest 11. an atom that has gained or lost electrons 13. like charges 15. for charged particles that are small compared to the distance between them, the force between the charges varies directly as the product of the charges and inversely as the square of the distance between them 20. negative charge 21. electrons are neither created nor destroyed

Down 1. a material, usually a metal, through which electric charge can flow 3. an atom or molecule is induced to be slightly more postive or negative than the opposite side 6. a force one electric charge exerts on another 7. the property to which the mutual repulsion of electrons or protons is attributed 9. neutral atom 12. a material that can be made to act as a conductor or insulator 14. electric charge that has been redistributed on an object due to the presence of a nearby charged object 16. a material that is a poor conductor 17. charging an object without direct contact 18. SI unit of charge 19. opposite charges