I will mark you brainliest. I hate saying that but that's what I gotta do. Steel Wool + Oxygen (Fire)
How is mass conserved when steel wool is lit on fire?
Just give me like 2 sentences if you can. If not that's totally fine :)

did anyone actually do this? like if anyone has submitted this i rly need .

58750.08068 is the answer i think

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.