Radioactive iodine is used to diagnose the disease of

The missing particle in the reaction,$_{92}^{235}U + _{0}^{1}n \to _{56}^{146}Ba + ... + 3_{0}^{1}n$ is

For the fission reaction $_{92}U^{235} + _0n^1 \to _{56}Ba^{140} + _yE^x + 2_0n^1$,the values of $x$ and $y$ are:

An element ${ }_{x} A^{y}$ emits $5$ $\alpha$ and $4$ $\beta$ particles to give ${ }_{82} B^{207}$. The number of protons and neutrons in $A$ are respectively

The age of the most ancient geological formations is estimated by:

The nuclear reaction $_3Li^6 + _1H^2 \to 2_2He^4 + \Delta E$ represents: