no
Sodium has no radioactive isotopes.
Yes, promethium, which is a lanthanide, has no stable isotopes.
Not all isotopes are radioactive; the radioactive isotopes are unstable and emit radiations.
Uranium deposits may contain infinitesimal amounts of technetium isotopes.
Both isotopes and radioactive isotopes are pretty much the same but radioactive isotopes are better because it can be used to make medicine.
You can date rock layers by radioactive dating using half-life in the igneous rock layers that contain radioactive isotopes like uranium or potassium. These isotopes decay at a known rate to stable daughter isotopes, allowing scientists to determine the age of the rock based on the ratio of parent to daughter isotopes present. Sedimentary rock layers cannot be dated directly using radioactive dating due to the possibility of contamination and the absence of radioactive isotopes in the rock itself.
Radioactive isotopes are not stable.
Three families of elements that contain no radioactive isotopes are the noble gases (such as helium, neon, and argon), the alkali metals (such as lithium, sodium, and potassium), and the alkaline earth metals (such as beryllium, magnesium, and calcium). These families consist of stable elements that do not have any naturally occurring radioactive isotopes.
All the uranium isotopes are radioactive.
All radioactive isotopes will disintegrate.
All isotopes of francium are radioactive.
radioactive isotopes! :)