Physical Science Module 13

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Across
  1. 2. this type of radioactive decay results in a neutron changing into a proton and emitting an electron
  2. 5. the force that keeps protons and neutrons in the nucleus
  3. 8. the scientist who developed the first model of an atom
  4. 9. this type of radioactive decay emits a ray only
  5. 11. atoms with the same number of protons but different numbers of neutrons
  6. 12. this type of radioactive particle can be stopped by paper
  7. 14. you need to make a lot of these about the original condition of an object in order to use radioactive dating
  8. 16. the product that results from radioactive decay
  9. 17. the sum of the numbers of neutrons and protons in the nucleus of an atom
  10. 18. an atom with a nucleus that is not stable
  11. 20. a collection of atoms that all have the same number of protons
  12. 21. the time it takes for half of the original sample of a radioactive isotope to decay
  13. 24. this element has 6 protons
Down
  1. 1. the force that keeps the electrons orbiting around the nucleus
  2. 3. the number of protons in an atom
  3. 4. the center of an atom, containing the protons and neutrons
  4. 6. the largest of the 3 main parts of an atom
  5. 7. this type of radioactive particle require several inches of lead to stop them
  6. 10. this type of radioactive decay emits a particle that contains two protons and two neutrons
  7. 13. the smallest of the 3 main parts of an atom
  8. 15. what an atom mostly consists of
  9. 18. if an atom has too many or too few neutrons it will be this
  10. 19. tiny particles exchanged by protons and neutrons
  11. 22. this element has 9 protons
  12. 23. a schematic description of a system that accounts for its known properties
  13. 24. this element has 29 protons