.- El fósforo-32 , un radioisótopo usado en el tratamiento de la leucemia, tiene una vida media de 14 días. Si una muestra contiene 8,0 g de fósforo-32. ¿Cuántos gramos de fósforo-32 permanecen después de 42 días?

a is the answer to this question

explanation:

listen, you cant how young you were.

"you didn't chose the stud life. the stud life chose you."

a is the correct answer

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.