Matter and Change

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Across
  1. 4. a pure substance made of only one kind of atom
  2. 5. the smallest particle of an element that can exist and still have the properties of that element
  3. 7. the amount of time that it takes for half of the atoms of a radioactive nuclide to decay
  4. 10. atoms of the same element that differ in the number of neutrons
  5. 12. composed mostly of protons and neutrons in the nucleus
  6. 15. a non evenly distributed mixture
  7. 16. a substance that is made from the atoms of two or more elements that are chemically combined
  8. 18. the spontaneous disintegration of the nucleus
  9. 19. the process by which the approximate age of an object is determined based on the amount of certain radioactive nuclides present
  10. 20. a change in which one or more substances are converted into different substances
Down
  1. 1. the amount of space something takes up
  2. 2. evenly distributed mixture
  3. 3. 2nd weakest type of radiation
  4. 6. strongest type of radiation
  5. 8. a change in a substance that does not involve a change in the identity of a substance
  6. 9. weakest type of radiation
  7. 11. when two or more pure substances combine physically
  8. 13. anything that has mass and volume
  9. 14. protons,neutrons, and electrons
  10. 17. a measure of the amount of matter in an object