81 Figure 42-20 shows part of the decay scheme of 257NP on a plot of mass number A versus proton number Z; five lines that represent either alpha decay or beta-minus decay connect dots that represent isotopes. What is the isotope at the end of the five decays (as marked with a question mark in Fig. 42-20)? 237NP Figure 42-20 Problem 81.

e) The nucleus16 B(Z=5)has not been detected in nuclear reaction studies. Explain why. (Please type answer no write by hend).

The most common isotope of uranium 23 U has a half-life of 4.47 x 10⁹ years, decaying to 92 234 Th by a emission. i) ii) iii) iv) Write down the nuclear decay equation. What is meant by the decay constant? Calculate the mass of uranium would be required for an activity of 6.00 µμCi. Calculate the number of a particle emitted per second by 30.0 g of uranium. [1 Ci = 3.70 x 10¹⁰ decays/s]

Based on data acquired during a radioactive decay lab using an unusual assortment of geometrically novel dice, the following trendline equation for an R vs. rolls graph is obtained: y = 321.03e-0.41x. Determine the decay constant, mean life, half-life, Nor & Ro. decay constant = mean life = half-life = R₂ = No = rolls rolls decays/roll dice rolls-1