Research how different fossil fuels compare in terms of the amount of carbon dioxide released per kwh of energy. how much carbon dioxide is produced by burning a gallon of gasoline? a gallon of diesel?

indium, and thallium have three electrons i think

dynamic equilibrium is the answer.

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.