Chapter 2 Vocabulary

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