These are types of high energy These are visible dark spots on particle outflows occurring in
the surface of the Sun caused
the Sun's photosphere by intense magnetic activity
forming areas of reduced
surface temperature.
This is the visible surface of the
Sun which is about 100 km
thick and composed of gas; it is
the region of the sun that
produces visible light
Photosphere
Corona
Sunspots
Prominence and Solar Flare

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.