The missing components in the table to the right are indicated with orange letters. Use the periodic
table in the tools bar to fill in the corresponding
values.
Element
8
Electron
affinity
(kJ/mol)
Electro-
negativity
Bromine
324.6
2.96
A
B
Chlorine
A
B
С
Magnesium
0
С
D
Sodium
52.8
D
DONE

explanation:

0.07 g/cm³

1.37 g/cm³

the answer is c i took the test

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.