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------------------------------------------------ Rhenium-186 is a radioactive isotope (t = 4.0 days) used for pain relief in bone cancer.

a) How many protons, neutrons, and electrons does rhenium-186 contain?

b) Write a balanced nuclear equation for the emission of a [tex]\beta[/tex] particle from rhenium-186.

c) If a vial contains 200.0 μg of rhenium-186, how much of the radioisotope remains after 16 days?

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:

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