The formula mass of a compound is the a) sum of the atomic masses of its atoms b) sum of the atomic numbers of its atoms c) product of the atomic masses of its atoms d) products of the atomic numbers of its atoms

am i too late?

explanation:

2b2t

explanation:

2b2t

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.