Be sure to answer all parts. The activity of a radioactive sample is the number nuclear disintegrations per second, which is equal to the first-order rate constant times the number of radioactive nuclei present. The fundamental unit of radioactivity is the curie (Ci), where 1 Ci corresponds to exactly 3.70 × 10¹0 disintegrations per second. This decay rate is equivalent to that of 1 g of radium-226. The molar mass of Ra-226 is 226.03 g/mol. Calculate the rate constant for the radium decay. x 10 (Enter your answer in scientific notation.) Calculate the half-life for the radium decay. x 10 (Enter your answer in scientific notation.) Starting with 1.9 g of the radium sample, what is the activity after 650 yr? Ci

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.