Uranium ultimately decays into a stable isotope of:

The reaction $_1H^2 + _1H^3 \to _2He^4 + _0n^1 + \text{energy}$ represents

The fuel used in an atomic pile is

The end product of the $4n$ series is:

$_{92}U^{235} + n \to \text{fission product} + \text{neutron} + 3.20 \times 10^{-11} \ J$. The energy released when $1 \ g$ of $_{92}U^{235}$ undergoes fission is

In a nuclear reactor,the chain reaction is controlled by introducing: