How is an occluded front different from a cold front?
warm air is pushed up during an occluded front, while cold air moves quickly during a cold front.
occluded fronts cause warm air to feel dry, while cold fronts cause ground temperatures to feel cooler.
warm air moves slowly during an occluded front, while cold air is cut off from the ground in a cold front.
occluded fronts cause rapid changes in weather conditions, while cold fronts cause widespread cloud formation

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.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.