Question

The polonium isotope 210

84 Po is unstable and emits a 5.30 MeV alpha particle. The

atomic mass of 210

84 Po is 20998 and that of 4

2He is 4.0026u. Identify the daughter nuclide

and find its atomic mass in u.

Answer 1

$_{84}^{210}Po\to_2^4He+_{82}^{206}Pb,$

$m=m_{Po}-m_{He}-\frac E {c^2}=205.9745~u.$