Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET)

Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET). The half-life of nitrogen-13 is  minutes. If you begin with 73.3 milligrams of nitrogen-13, how many milligrams will you have left after  minutes have passed?

2.Gallium-67 is used medically in tumor-seeking agents.

The half-life of gallium-67 is 78.2 hours. If you begin with 86.7 milligrams of gallium-67, how many milligrams will you have left after 235 hours have passed?

3.Gallium-67 is used medically in tumor-seeking agents.

The half-life of gallium-67 is 78.2 hours. How many milligrams of a 54.0 milligram sample of gallium-67 will be lost by radioactive decay during 235 hours?

4. a balanced nuclear equation for the decay of strontium-90 to yttrium-90.

5. a balanced nuclear equation for the decay of uranium-234 to thorium-230.

6. a balanced nuclear equation for the following:

The nuclide nitrogen-13 undergoes positron emission.

7.a balanced nuclear equation for the following:

The nuclide cesium-129 undergoes electron capture.