Yes; some of the naturally occurring isotopes of the heaviest elements are radioactive.
No. Nitrogen is not naturally radioactive.
Some elements have radioactive isotopes, some do not.
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Sodium chloride is a chemical compound not an isotope. But:- natural sodium contain the rare radioactive isotope 22Na and the stable isotope 23Na- natural chlorine contain the rare radioactive isotope 36Cl and the stable isotopes 35Cl and 37Cl
Thorium, plutonium and iron are radioactive (be sure, the natural isotope 54Fe is radioactive !).
When an isotope is unstable, it is said to be radioactive.
The radioactive isotope is disintegrated in time and emit radiations.
when an isotope is it does not undergo radioactive decay
Sodium chloride is a chemical compound not an isotope. But:- natural sodium contain the rare radioactive isotope 22Na and the stable isotope 23Na- natural chlorine contain the rare radioactive isotope 36Cl and the stable isotopes 35Cl and 37Cl
Thorium, plutonium and iron are radioactive (be sure, the natural isotope 54Fe is radioactive !).
Hydrogen has only one natural radioactive isotope(3H), of cosmogenic origin, but only in ultratraces on the earth. Sodium has two radioactive natural isotopes (22Na and 24Na), of cosmogenic origin, but only in ultratraces on the earth. Oxygen has not natural radioactive isotopes. All the isotopes of uranium are radioactive.
When an isotope is unstable, it is said to be radioactive.
Deuterium is an example of natural, non-radioactive isotope; deuterium is the isotope of hydrogen with 1 proton and 1 neutron.
The radioactive isotope is disintegrated in time and emit radiations.
The radioactive isotope is disintegrated in time and emit radiations.
when an isotope is it does not undergo radioactive decay
Natural germanium has only one radioactive isotope - germanium 76. 27 artificial radioisotopes of germanium are known.
The half life of an isotope refers to the rate at which a radioactive isotope undergoes radioactive decay. Specifically, it is the amount of time it takes for half of a given sample of a radioactive isotope to decay.
That's called a daughter isotope, or a daughter product. (The original isotope that decayed is the parent isotope.)
The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay. The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.