Use the library and other reference materials to research the discovery of radioactivity and its current applications. Then, write a 500 word report on what you have learned. Be sure to include the contributions of French chemists Marie Curie and Pierre Curie and the medical uses of radiation.

answer:

This isn't a question, this is simply asking us to do your homework.

There is no library to access, and if you truly do have any sources to give me, I'd be more than happy to type up a 500 word report for you.

the answer is 0.8m.

by: nicholas

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.