Which of the following objects is accelerating? a patriotic statue in center of the park
a car moving at a constant speed in a straight line
a car moving at a constant speed through a curve
a flower pot falling from a 2nd story window

the maximum mass of nh3 is nh3 in grams

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.