Many of the d-amino acids found in nature have been discovered in bacterially produced peptides that have antibiotic properties. bacteria secrete these peptides into their environments to kill competitor bacteria and thereby gain a selective advantage. given your answer to part (a) of this question, what potential advantages might d-amino acids confer to a secreted peptide toxin?

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.