12. The products of several precipitation reactions are given below. In each case, identify which product is the precipitate.
a) barium sulfate and sodium sulfide
b) lithium chloride and magnesium hydroxide
c) zinc chloride and calcium fluoride

answer: i dont know the answer but this might

explanation:

l

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.