Will mark ! bonny wrote the following examples of changes in substances. example a: soap and detergents remove oil. example b: water in a bowl evaporates on a sunny day. which statement is correct? both are examples of physical changes. both are examples of chemical changes. example a describes a physical change and example b describes a chemical change. example a describes a chemical change and example b describes a physical change.

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.