Look at the image below. HI
Both of the people on the left are pulling with a force of 55 N to
the left. On the right side of the rope, one person is pulling with
35 N to the right, and the other person is pulling 20 N to the right.
What is the net force on the rope?

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.

answerapplication program;