For the past 5 days, four times as many samples as usual submitted for ionized calcium were below the reference range. The same phlebotomist collected all the samples. When questioned, she said that the samples were collected using syringes from an arterial blood gas collection kit. What is the best explanation of these results

level 4 to level 2 : ))

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.