Today are known approx. 3 000 radioactive isotopes, natural or artificial.
27
You think probable to radioactive decay.
All of them.
All radioactive isotopes will disintegrate.
All the isotopes of californium are radioactive, artificial and unstable.
Some examples are deuterium and tritium which are radioactive isotopes of hydrogen.
Chromium has 25 known isotopes, 2 isomers, 3 of which are non-radioactive.
No, there are many stable isotopes.
You think probable to radioactive decay.
Not all isotopes are radioactive; the radioactive isotopes are unstable and emit radiations.
Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.
Most of the natural occurring (isotopes of) elements are NOT radioactive.Though most of all the known isotopes are radioactive but most of them do NOT naturally occur.
Natural germanium has only one radioactive isotope - germanium 76. 27 artificial radioisotopes of germanium are known.
Both isotopes and radioactive isotopes are pretty much the same but radioactive isotopes are better because it can be used to make medicine.
2
All of them.
Sodium has no radioactive isotopes.
Radioactive isotopes are not stable.