(a)[1]
In the equation above, circle every symbol that stands for a lepton.
(b)[1]
State the particle name shown by the symbol $\bar{\nu}$.
(c)[1]
Because energy is released in the decay, state which form of energy nucleus Y gains.
(d)[2]
Using the compositions of X and Y, state and explain whether they are isotopes.
(e)[1]
During the emission of a $\beta^-$ particle, the quark composition of one nucleon in X changes. Describe this change.