U-238 has 92 protons, 146 neutrons, and 92 electrons.
Rn-222 has 86 protons, 136 neutrons, and 86 electrons.
U-238 is Uranium 238 and Rn-222 is Radon 222.
It forms magnesium nitride
anything with plus or minus on them are ions
so that is 4 of them
po4-3
hco3-
al+3
hg2+2