Answer :
Final answer:
Rhenium-186 has 75 protons, 111 neutrons, and 75 electrons. The balanced nuclear equation for the emission of a beta particle from rhenium-186 is 186Re -> 186Os + e-. After 16 days, about 1/16th (6.25%) of the initial amount of rhenium-186 remains in the vial, which is approximately 12.5 μg.
Explanation:
a) Rhenium-186 has 75 protons, 111 neutrons, and 75 electrons.
b) The balanced nuclear equation for the emission of a beta particle from rhenium-186 is 186Re -> 186Os + e-.
c) After 16 days, about 1/16th (6.25%) of the initial amount of rhenium-186 remains in the vial, which is approximately 12.5 μg.
Learn more about Rhenium-186 properties and decay here:
https://brainly.com/question/4610467
#SPJ11