CHE 1302 Lecture Notes - Lecture 21: Exponential Decay, Alpha Decay, Half-Life
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Baker | che 1302 | summer 2017 | lecture 21 | page 1. Still fall apart from time to time (hence, radioactivity) The atomic mass listed for ne is 20. 2 g/mol. This is based off of the 20ne, 21ne, and 22ne isotopes we see in the field. A plot of protons vs neutrons: green dots - stable isotopes, yellow dots - all known isotopes (kind of a yellow smear) The neutron : proton ratio helps predict p+ decay vs e- capture. At low z, n/z is close to 1 for stable nuclei. At higher z, more neutrons are needed to reach stability so stable n/z increases. Anything along the red line has a 1:1 neutron : proton ratio. Baker | che 1302 | summer 2017 | lecture 21 | page 2. Radioactive decay law - the rate of decay of a radioactive nuclide is proportional to the number of atoms present, n.
