Henry is in the community investigating sources of chemical energy for his science experiment. Select the best examples of chemical energy Henry can use.
Answer options -
A gas station and people playing hopscotch
A squirrel eating acorns and a fire burning
Someone reading a book and eating a sandwich
Someone sliding down the slide and someone drinking water Answer options -

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.