The size of the atomic nucleus is determined by the number of protons and neutrons it contains, as well as the forces that hold these particles together. The nucleus itself is incredibly tiny compared to the overall size of an atom. It has a diameter on the order of a few femtometers (10^(-15) meters).
In general, it is not possible to stretch or increase the size of an atomic nucleus without altering its fundamental structure. The nucleus is held together by strong nuclear forces, which are extremely powerful and bind the protons and neutrons together. These forces act over very short distances and resist attempts to separate or stretch the nucleus.
If an external force were applied to try to stretch the nucleus, it would require an immense amount of energy to overcome the strong nuclear forces. Moreover, such an attempt would likely result in the disruption of the nucleus, leading to the release of nuclear particles or even causing nuclear reactions.
It is worth noting that there are ways to change the size or shape of atomic nuclei under certain conditions. For example, in high-energy physics experiments or nuclear reactions, nuclei can be excited or fragmented, leading to the formation of different isotopes or nuclear particles. However, these processes typically involve extreme conditions and energies that are not achievable under normal circumstances.
In summary, under normal conditions, the size of an atomic nucleus is determined by its composition and the strong nuclear forces that hold it together, and it is not feasible to stretch or increase its size without significantly altering its structure.