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Across 2. materials that electrons can move easily through 4. The atoms in a magnet are aligned according to ________________ 8. particles that move around the nucleus and are negatively charged 10. contain atoms that are all alike 11. is 21% of the earth's atmosphere 12. a state of matter 13. Atoms lose or gain electrons to become __________.

Down 1. the scattering of light by colloids 3. are used to represent valence electrons 4. composed of substances that can be separated by any physical means 5. the force that holds a chemical bond together in a compound 6. is 78% of the earth's atmosphere 7. Protons have a _____ charge 9. the total charge on a compound due to the same number of protons and electrons