Identification and Characterization of Unstable and Stable Nuclei 10 of 19 > A Review Constants Periodic Table JUOMI Nuclear stability can in general be predicted based on the following considerations: • Nuclei with 84 protons or more are unstable

Identification and Characterization of Unstable and Stable Nuclei 10 of 19 > A Review Constants Periodic Table JUOMI Nuclear stability can in general be predicted based on the following considerations: • Nuclei with 84 protons or more are unstable. • Nuclei containing a magic number of protons and/or neutrons tend to be stable. • Stable nuclei often contain even numbers of protons and/or neutrons. Predicting the decay mode Based on the valley of stability, the following processes generally tend to produce more stable neutron-to-proton (n/p) ratios: • Nuclei with Z> 84 tend to undergo a emission. • Nuclei with high n/p ratios undergo ( Le) emission. • Heavy nuclei with low n/p ratios are more likely to undergo electron (le) capture. • Light nuclei with low n/p ratios are more likely to undergo positron (e) emission. The classification "high" or "low" n/p ratio can be determined by finding the coordinates on the graph that correspond to the number of protons (z or horizontal value) and neutrons (y or vertical value) in a given isotope. Then, observe whether this set of coordinates is above, within, or below the stability valley. These factors are reflected in the given graph (Figure 1). which shows the valley of stability as a function of number of neutrons and protons. Part B Figure 1 of 1 Using general tendencies and the chart given in the introduction, predict the most likely mode of decay of each of the following radioactive isotopes. Drag the appropriate items to their respective bins. View Available Hint(s) Belt of stability Number of neutrons Reset Help 1.1 neutron-to- proton ratio platinum-183 promine-20 potassium-47 thortum-232 carbon 11 10 20 30 40 50 60 71
Identification and Characterization of Unstable and Stable Nuclei 10 of 19 >> Review | Constants Periodic Table Nuclear stability can in general be predicted based on the following considerations: "Magic" numbers A magic number is the name given to certain numbers of protons or neutrons that have a high correlation to stability in nuclei: • Nuclei with 84 protons or more are unstable. • Nuclei containing a magic number of protons and/or neutrons tend to be stable. • Stable nuclei often contain even numbers of protons and/or neutrons. magic numbers of protons: 2,8, 20, 28, 50, 82 magic numbers of neutrons: 2,8, 20, 28, 50, 82, 126, 184 These factors are reflected in the given graph (Figure 1). which shows the valley of stability as a function of number of neutrons and protons. A plot of the number of neutrons versus the number of protons for all known stable nuclei, represented by reddish brown dots on the graph, shows that these nuclei cluster together in a region known as the valley of stability. Nuclei with a ratio that is too high tend to undergo beta decay. Nuclei with a ratio that is too low tend to undergo positron emission or electron capture. Part A Figure Using general trends, predict the stability of the following nuclei. Drag the appropriate items to their respective bins. 110 View Available Hint(s) Belt of stability Reset Help Number of neutrons [Chromium-52 O s ilicon-28 (radium-20 promino-82 1:1 neutron-to- proton ratio 0 10 70 80 20 30 40 50 60 Number of protons Stable Radioactive
M Review | Constants 1 Periodic Table Nuclear stability can in general be predicted based on the following considerations: Part B • Nuclei with 84 protons or more are unstable. Nuclei containing a magic number of protons and/or neutrons tend to be stable. Stable nuclei often contain even numbers of protons and/or neutrons. Using general tendencies and the chart given in the introduction, predict the most likely mode of decay of each of the following radioactive isotopes. Drag the appropriate items to their respective bins. ? View Available Hint(s) These factors are reflected in the given graph (Figure 1), which shows the valley of stability as a function of number of neutrons and protons. Reset Help platinum-183 platinum-188 bromine-90 potassium-47 bromine 20 potasium 47 (Thorium-22 (carbon-11 thorium-232 carbon-11 Figure 1 of 1 > Belt of stability ladecay | pdecay Veemission Lecapture Number of neutrons ARAW 1:1 neutron-to- proton ratio 0 10 70 80 20 30 40 50 60 Number of protons
????????????????? Identification and Characterization of Unstable and Stable Nuclei 10 of 19 > I Review | Constants Periodic Table Nuclear stability can in general be predicted based on the following considerations: Part A • Nuclei with 84 protons or more are unstable. . Nuclei containing a magic number of protons and/or neutrons tend to be stable. • Stable nuclei often contain even numbers of protons and/or neutrons. Using general trends, predict the stability of the following nuclei. Drag the appropriate items to their respective bins. View Available Hint(s) These factors are reflected in the given graph (Figure 1). which shows the valley of stability as a function of number of neutrons and protons. Reset Help Figure 1 of 1 chromium-52 silicon 28 rachum 228 bromino 82 Belt of stability Stable Radioactive Number of neutrons chlorine 36 1.1 neutron-to- proton ratio 0 10 70 80 20 30 40 50 60 Number of protons