Select the correct answer.
which sentence describes an example of sublimation?
a.
dew forms on leaves on a cold morning.
b.
liquid deodorant sprayed on a person’s body evaporates.
c.
dry ice changes to carbon dioxide when kept in an open container.
d.
ice cream in a bowl melts.
e.
water vapor condenses on a cold surface and forms droplets.

C

Explanation:

Sublimation is the change from solid state to gaseous state.

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.