A biologist plans to spend a year investigating the mating behavior of a certain species of frog. to make meaningful observations, the biologist should observe a) a small number of frogs in their natural habitat
b) A large number of frogs in their natural habitat
c) several groups of frogs maintained in different temperatures in the laboratory
d) several groups of frogs maintained on different diets in the laboratory

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.

i believe the answer is 5,000