Across
- 2. negatively charged particle
- 4. electrons in the outermost energy level
- 5. small, dense, positively charged core
- 7. theory idea that matter is made of fundamental particles called atoms
- 8. waves to which our eyes are sensitive and interpret as colors
- 11. whole range of electromagnetic radiation
- 16. have the highest frequencies and shortest wavelengths
- 17. positively charged particle
- 20. a fact of nature observed so often that it becomes accepted truth
- 24. sum of the protons and neutrons in the nucleus
- 25. used for communications and cooking
- 26. neutral particle
Down
- 1. space around the nucleus where electrons are found
- 3. elements in compounds were always in a certain proportion
- 6. spectrum of light released from excited atoms
- 9. testable prediction to explain observations
- 10. illustrates valence electrons as dots
- 12. regions of space in which electrons move about the nucleus
- 13. explanation based on many observations and supported by many experiments
- 14. the number of protons in the nucleus
- 15. part of sunlight that causes sunburns
- 18. lowest frequencies on the spectrum; AM+FM
- 19. smallest particle of matter
- 21. given off by the human body and warm objects
- 22. pass through soft body tissue but are stopped by bone
- 23. atoms that are chemically alike and different in mass