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Technically speaking, depending on the sample, the rock could become “stable.”

The radioactive decay of a radioisotope is expressed as a half-life equation; half-life is the colloquial term that describes how long it will take for half of the radioisotope to decay into another isotope or element. For example (if I remember correctly), Carbon-14 has a half life of 5,780 years. This means that in a 100% sample of C-14, after 5780 years passes, only 50% of that isotope would remain; another 5780 years, and only 25% would remain (half of half). Based on this principle, it seems like a sample could never fully decay because there’s always an amount that smaller than the current amount.

However, if the sample has a very short half life (milliseconds or nanoseconds) the sample would reach nigh-full decay eventually. At this point, it is considered “stable.”
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Excess of neutrons and protons cause large amount of energy in the nucleus, which cause the instability of the radioactive rock.

What is a radioactive rock?

Radioactive rock consist of atoms of radioisotopes like thorium and uranium.

Excess neutrons or protons in an element's atoms provide extra energy in the nucleus.

That cause the atom to become imbalanced or unstable.

Whether and how radioactive elements can also become stable.

Radiation is emitted by the unstable nuclei of radioactive atoms.

Thus, the because of the nucleus, of the radioactive rock never become completely stable.

Learn more about rocks, here:

https://brainly.com/question/6565164

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