Which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? Drag the appropriate items to their respective bins. View Available Hint(s) Reset Help Human activities such as the combustion of fossil fuels, has increased the levels of greenhouse At dew point, the water vapor begins to condense out of air. gases. Human activities, such as the combustion of fossil fuels, generate the aerosols. You observe hail when the temperatures are below the freezing point. Carbon dioxide is produced during respiration of plants, animals, fungi, and microorganisms. Chemical reaction Physical change

1) Human activities such as the combustion of fossil fuels, has increased the levels of greenhouse gases  Chemical reaction.

2) At dew point, the water vapor begins to condense out of air  Physical changes.

3)  Human activities, such as the combustion of fossil fuels, generate the aerosols  Chemical reaction.

4) You observe hail when the temperatures are below the freezing point  Physical changes.

5) Carbon dioxide is produced during respiration of plants, animals, fungi, and microorganisms  Chemical changes.

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.