Neutralize 51 grams of monofunctional acid A with enough dd NaOH, evaporate the solution after the reaction, yielding 62 grams of solid. The number of possible CTCTs of A is A

"the periodic table is arranged in order of atomic number."

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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.