Atomic Structure

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Across
  1. 5. Using radiation to explore internal organs (7) T------ p104
  2. 8. The number of protons in an atom (6,6) A----- N----- p89
  3. 10. Total number of protons and neutrons in an atom (4,6) M--- N----- p89
  4. 12. Negative part of an atom (8) E-------- p88
  5. 13. Model of an atom with electrons embedded in positive sphere (4,7) P--- P------ p91
  6. 16. The process of exposing an object to radiation (11) I---------- p105
  7. 19. Unit for radioactive activity (Bq) (9) B-------- p99
  8. 22. The time taken for half the radioactive nuclei to decay (4,4) H--- L--- p99
  9. 23. Type of radiation consisting of 2 protons and 2 neutrons (Helium nucleus) (5,8) A---- P------- p94
  10. 24. Absorption or emission of _______________ _________ may cause electrons to change energy levels (15,9) E-------------- R-------- p92
  11. 25. Neutral part of the nucleus of an atom (7) N------- p88
  12. 26. An atom that has a positive or negative charge (3) I-- p89
  13. 27. The charge on an ion that has lost electrons (8) P------- P89
  14. 29. 1/10,000th the radius of an atom where most of the mass is found (7) N------ p88
  15. 30. Splitting large unstable nuclei (7) F------ p106
Down
  1. 1. Source of background radiation from space (6,4) C----- R--- P97
  2. 2. Used to slow nuclear fission in a power station (7,4) C------ R--- p107
  3. 3. Positive part of the nucleus of an atom (6) P------ p88
  4. 4. Unit for radiation dose (Sv) (7) S------ p102
  5. 6. Type of radiation consisting electromagnetic radiation from the nucleus (5,3) G---- R-- p94
  6. 7. Normal level of radiation that is around us all the time (10,9) B--------- R-------- p97
  7. 9. Used to detect radiation (6,6,4) G----- M----- T--- p96
  8. 11. A reaction that, once started, continues by itself (5,8) C---- R------- p107
  9. 14. 1 sievert = 1000 _____________ (13) M------------ p102
  10. 15. Type of radiation consisting of a high speed electron from the nucleus (Neutron changes to proton) (4,8) B--- P------- p94
  11. 17. This occurs when radiation creates ions (10) I--------- p95
  12. 18. The charge on an ion that has gained electrons (8) N------- P89
  13. 20. Using radiation to find the age of organic material (6,6) C----- D----- p100
  14. 21. Joining 2 light nuclei into a heavier nucleus (6) F----- p108
  15. 28. Different form of an element with a different number of neutrons (7) I------ p90