A discovery revealed a parchment fragment that had about 64% as much 14C radioactivity as does plant material on the earth today. Estimate the age (in years) of the parchment. (Round your answer to the nearest hundred years.) 2.

Identification and Characterization of Unstable and Stable Nuclei 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. 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. Figure Number of neutrons 110 90 Belt of stability na 80 70 60 60 7 50 40 30 1:1 neutron-to- 20 proton ratio 10 100 0 0 Casan? 10 20 30 40 50 60 70 80 Number of protons 84 tend to undergo a emission. • Nuclei with high n/p ratios undergo Be) emission. • Heavy nuclei with low n/p ratios are more likely to undergo electron (e) capture. • Light nuclei with low n/p ratios are more likely to undergo positron (e) emission. . ▾ Part B The classification "high" or "low" n/p ratio can be determined by finding…

What is the nuclear symbol for the missing nuclide? • Type "/" to create a fraction to get a "superscript" and "subscript" before your chemical symbol 140 Nd→ 18 +

Write the complete decay equation for the given nuclide in the complete A ZXN  notation. Refer to the periodic table for values of Z. (Use 01β to signify the following part of the equation: ?+ + ?e.) ?+ decay of 115Te