### Can you write the nuclear decay equation for the beta

20.08.2014· In any nuclear equation, the sum of the subscripts (atomic nuers, Z) and the sum of the superscripts (atomic masses, M) must be equal on each side of the equation. For the β decay of iodine 131, we have. 131 53 I → lM Z X +l0 -1e. Hence. 131 = M +0, so M = 131. 53 = Z - 1, so Z = 53+ 1 = 54. The element X with Z = 54 is Xe. So the equation is.