Here are the appropriate pairs for the items given:
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Results in particles with larger masses than the beginning nuclides
- Not applicable (none of the provided responses fit this description directly)
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A spontaneous process that can occur if a nuclide has an unstable arrangement of particles in its nucleus
- Radioactive decay (This implies that the nuclide is unstable and will decay spontaneously)
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Results in particles that have smaller masses than the original parent nuclide
- Nuclear fission or fusion (In these processes, the products typically have smaller masses than the parent nuclide)
If the responses do not match exactly, please clarify or provide extra options for better pairing.