01:160:163 Lecture Notes - Lecture 21: Beta Decay, Positron, Half-Life
19 May 2016
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Document Summary
2,8,20,28,50,82,126 are all very stable atomic numbers for nuclei to have so these elements are the most stable of the table. Odd z and odd n numbers often are more stable because then they are even when added . All isotopes of atomic numbers greater than 83 are radioactive isotopes decay by beta emission, positron emission, or electron capture. Technium and promethium isotopes are all radioactive. If the ratio of n/z is less than 1, then the isotope will be radioactive. N/z is equivalent to neutrons/ protons ratio (use subtraction to find the number of neutrons from the a value of the a/z ratio of common state) Sequence of nuclear reactions that eventually will result in a stable isotope formation. Nuclear binding energy: quantitative measure of nucleus stability. The energy required to break up one nucleus into the smaller protons and neutrons. Nucleus + nuclear binding energy nucleons.
