Suppose that the two elements A (represented by triangles) and B (represented by squares) form a molecular compound with the molecular formula A2B, and that two other elements, C (represented by circles) and D (represented by diamonds), form an ionic compound with the formula CD. Draw a molecular-level view of each compound.

wwe

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.