Which of the following is not true regarding the conjugation of 1,3 butadiene ( ) All atoms are sp2 hybridized The C-C single bond is shorter than a single bond found in butane It is more stable than 1-butene Electron density is shared throughout the molecule All of the above are true

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.