What must be balanced in order to have a balanced chemical equation? A. The total number of atoms or ions of each element
B. The total number of molecules or formula units of each compound
C. The total volume of all gases included in the reaction
D. All of the above

the energy to form plasma comes from heat or electricity in the atmosphere!

sunny~ ☺

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

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.