39 Radioactivity&NuclearReactions

39 Radioactivity&NuclearReactions - The Belt of...

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1 1 The Belt of Stable Nuclides Plot of N and Z values of the stable nuclides. The stable nuclides lie along a belt that lies between N = Z and N = 1.54 Z . Ends at 83 2 How to recognize a stable nuclide when you see one: guidelines for stability (write these down) For Z< 20, N=Z and/or Z+1 are stable Otherwise N>Z+1 Notable exceptions hydrogen, deuterium, tritium (unstable) For He (Z = 2): N = 1 & 2 are stable, N=Z+1 unstable As Z becomes larger, the ratio N/Z increases. N/Z = 1.54 max H, Li, B, N All with Z>83 are unstable.
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2 3 In-Class Questions on Stability Which isotope of hydrogen is unstable? A) 1 H hydrogen B) 2 H deuterium C) 3 H tritium D) all three are stable Hydrogen Z = 1, N = 0 Deuterium Z = 1, N = 1 Tritium Z = 1, N = 2, unstable 4 Identify each nuclide as stable or unstable and explain why in terms of one of the guidelines. 222 86 Rn (N= 136) Z > 83 unstable A) Stable B) Unstable
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3 5 Which one is stable? A)
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39 Radioactivity&amp;amp;NuclearReactions - The Belt of...

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