stable
Each isotope, stable or unstable, has a specific symbol; for example K-40 for potassium 40.
The antonym of stable is unstable.
is peru government stable or unstable
cuba is stable
stable
Unstable.
The opposite of stable is unstable or variable.
Helium is a stable element.
Unstable
Selenium is generally considered stable in its elemental form. However, some of its isotopes are unstable and undergo radioactive decay.
Critical Unstable Potentially Unstable Stable
In general, Canada is a stable country.