What are isodiaphers? Explain with an example

Isodiaphers:

• Isodiaphers are a set of nuclides with the same difference in the number of protons and neutrons in their nucleus.
• Both nuclides have different numbers of protons and neutrons in their nuclei, but the difference is the same.

Example of Isodiaphers:

Uranium $\left[{}_{92}{}^{238}\mathrm{U}\right]$ and thorium $\left[{}_{90}{}^{234}\mathrm{Th}\right]$ .

• Uranium's nucleus contains$92$ protons and $146$ neutrons, hence the difference is: $146–92=54$.
• Thorium's nucleus contains $90$ protons and $144$ neutrons, hence the difference is: $144–90=54.$
• As a result, isodiaphers are nuclides with the same amount of protons and neutrons in their nucleus.
• The difference between uranium $\left(\mathrm{U}\right)$ and thorium $\left(\mathrm{Th}\right)$ is $54$.