Fill in the following table:

21.6) Consider the following equation: The mass number of element X is: 247A + 18B → 89C + {x}X + 2 1n

The first four steps in the radioactive decay sequence of Po-218 are a, B, a, B. To write the reaction equations for this decay series, first determine the product of t step. a decay of Po-218 gives: symbol = Pb mass number = 214 atomic number = 82 Po undergoes four decay reactions: a, B, a, B. Step 1. 218 Po undergoes a decay to give Pb In the second step, Pb-214 undergoes ß decay. What is the product of this step? symbol = mass number = atomic number =

14. Using a mass spectrometer, a sample of an ancient wooden object was found to have a ratio of 14C to 12C equal to 3.3×10 −13 as compared to a current biological sample, which has a ratio of 14C to ¹2C of 1.2×10 −12 (Given: t, is 5730 years) What is the age of the object? 15. For the reaction, 2 A(g) + B₂(g) → 2 AB(g) The rate law is; rate = k[A][B₂]³ At 22.0 °C, k = 1234 M-³s-¹. What would be the rate of the reaction if the concentration of A is 0.100 M and concentration of B₂ is 0.125 M.

Which will complete this equation?

238 92U +15n - What element is synthesized from the reaction: > 70-1B + _? 25385AE 25399Et 146100FM 246 144FI

2. Tellurium-123 is a radioactive isotope occurring in natural tellurium. The decay constant is 1.7 x 1021 / s. What is the half-life in years?