Question

Predict the mode of decay of (a) plutonium-239, (b) Indium-120. Show your solution

Answer 1

Part a

$plutonium-239 \implies \alpha - decay\\\\ _{94}^{239} Pa \to _{92}^{235} U + _{2}^{4} \alpha$

Part b

$Indium-120 \implies \alpha - decay\\\\ _{49}^{120} In \to _{50}^{120} Sn + _{-1}^{0} e$