9. Write your observations on a sheel of paper. Questions:
1. What do you observe on the wall when light strikes an object in the dark room? Describe what you
observed.
2. Did you get the same result outside the house? Why?
3. What did you observe when light strikes a clear plastic sheel? What was formed and why?
4. Based from your observation, what are shadows?
5. How are shadows formed?
6. Do all objects form shadows? Why?​

pv=nrt

explanation:

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.