5. A mineral sample is found to have a density of 3.0 grams per cubic centimeter. It is then
broken into two pieces, with one piece twice as
large as the other. The smaller of the two pieces
will have a density of
A) 1.0 g/cm3 B) 1.5 g/cm3
C) 3.0 g/cm3 D) 6.0 g/cm3

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

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.