Polonium-210 has a Atomic mass of 210 g/mol. The reaction of decay is shown as, ²¹⁰₈₄Po ---------> ᵇₐX + ⁴₂He where, X = Unknown Element ᵇ = Atomic Mass of Unknown Element ᵃ = Atomic number of Unknown Element Solving for ᵇ, 210 = ᵇ + 4 ᵇ = 210 - 4 ᵇ = 206
Solving for ₐ , 84 = ₐ + 2 ₐ = 84 - 2 ₐ = 82
Now, Putting values in ᵇ and ₐ of X,
²⁰⁶₈₂X Searching Periodic table for atomic number 82.
²⁰⁶₈₂Pb
Result: The child Isotope is Lead (Pb) having atomic number 82 and Atomic mass 206 g/mol.
