Fe + Br2 --> FeBr3 How many atoms of iron (Fe) are in the reactants?

How many atoms of bromine (Br) are in the reactants?

How many molecules of bromine are in the reactants?

How many atoms of iron (Fe) are in the products?

How many atoms of bromine (Br) are in the products?

How many particles of iron (III) bromide are in the products?

Is this equation balanced?

If the equation is not balanced, then balance it below :

__Fe + __Br2 ——-> __FeBr3

confused

confused             hewdejdnjnjsnd

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.