Convert the length of the racetrack, the checkpoint distances, and the heights of the lower and higher racetracks from centimeters to meters. Record your answers in Table A. Then record the appropriate racetrack heights and
checkpoint distances, in meters, in the left column of Tables B and D.
Tools

heat or electricity in the atmosphere- c.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

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.