Hydrogen-1 and hydrogen-2 isotopes are radioactively stable.
Hydrogen is not radioactive; its two most common isotopes are stable.
Hydrogen has three isotopes
It really isn't elements that are stable or unstable, but isotopes. Carbon has both stable and unstable isotopes.
Xenon has eight stable naturally occuring isotopes. Besides these stable forms, there are over 40 unstable isotopes that have been studied.
It has 10
Tin or Stannum with 10 stable isotopes
The most stable isotopes of nitrogen are 14N and 15N.
Radioactive isotopes are not stable.
Stable isotopes are used as tracers.
copper has 2 stable isotopes
Hydrogen-1 and hydrogen-2 isotopes are radioactively stable.
If you mean oxygen: like most elements, it has both stable isotopes, and unstable (i.e., radioactive) isotopes. 16O, 17O and 18O are stable; the unstable (radioactive) isotopes include 15O and 14O.
Stable isotopes are chemical isotopes that are not radioactive, meaning that they do not spontaneously undergo radioactive decay.
Thorium, radium, radon, polonium, thallium, etc.
Hydrogen-1 and hydrogen-2 isotopes are radioactively stable.
The most stable of any element is found free in nature. Sometimes isotopes are also found along with the most stable of an element. Isotopes usually have short half life.