0.829 moles of calcium chloride is dissolved in 152 grams of water. What will the new boiling point, in Celsius, of this solution be? The kb for water is 0.520 J/°C and the boiling point for water is 100.°C.

the answer is c.the valence of the atoms combine .

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.