For science homework, a student was responsible for creating a model that accurately represented the law of conservation of matter. The model below depicts this student's attempt at creating the model by using the chemical reaction that creates water. Based on the evidence, write a scientific explanation that describes why the model pictured above does not follow the law of conservation of matter.

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.