The diagram will be labelled as reaction A: chemical reaction , B: nuclear reaction.
What is a nuclear reaction ?
The reactions that involve change in the identity or characteristics of an atomic nucleus, induced by bombarding it with an energetic particle.
The bombarding particle may be an alpha particle, a gamma-ray photon, a neutron, a proton, or a heavy ion.
In the given diagram , It can be seen that in the first circle it is written that it happens outside the nucleus , electrons are involved and less energy is released , these are the traits of a chemical reaction
In the second circle it can be seen that neutrons are involved , the reaction is happening inside the nucleus and relatively large amount of energy is released, these are the traits of a nuclear reaction.
Therefore the diagram will be labelled as reaction A: chemical reaction B: nuclear reaction
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