Hydrochloric acid reacts with sodium hydroxide to form water and sodium chloride. Hydrochloric acids is an extremely acidic, clear, corrosive liquid. sodium hydroxide is a very basic white solid. What can be known about the reactants of this reaction?

3 1/4 %

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.