Which of the following is not an example of weathering? a
Oxidation leads to rust formation in rocks when iron reacts with water and oxygen.
b
rocks are dropped into a riverbed when the river slows as it turns at a bend.
c
Ice wedging due to repeated freezing and thawing of water within cracks in rocks.
d
Plants roots push and crack rocks as they grow.

fe 55.85 g/mol and h2o 18.02 g/mol.

answer carbon and three oxygen atoms;

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.