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en.wikipedia.org/wiki/Isotope

Isotopes are variants of a particular chemical element which differ in neutron number. ..... Of 35 primordial radionuclides there exist four even-odd nuclides ( see table at right), including the fissile 235 92U . Because of their odd neutron numbers, ...

www.chemicalforums.com/index.php?topic=3952.0

Because they can? If a nucleus can exist with the same number of protons, but different numbers of electrons...then it will at some point ...

www.quora.com/Why-do-isotopes-exist

I understand isotopes are elements/atoms that are all the same but have ... It's easy to pick up an extra neutron. It comes in, it sticks with nuclear force, no problem.

www.quora.com/Why-do-isotopes-exist-according-to-chemistry

The creation of isotopes is answered by physics, though there is not always a clear delineation between these fields at the atomic level. Isotopes can be created from ...

chem.libretexts.org/Core/Physical_and_Theoretical_Chemistry/Atomic_Theory/Isotopes

Jul 16, 2015 ... There are naturally occurring isotopes and isotopes that … ... 137 C s and 90 S r do not occur naturally and are only present in the atmosphere ...

www.reference.com/science/isotopes-exist-75941fa0d3c396eb

Isotopes exist because the atomic nuclei of many elements are stable or somewhat stable with different numbers of neutrons in them. Because the identity of an ...

www.scienceclarified.com/everyday/Real-Life-Chemistry-Vol-1/Isotopes-How-it-works.html

Due to their high levels of radioactivity, they exist only for extremely short ... the same number of neutrons as it does protons and electrons: some do, but this is ...

socratic.org/questions/why-do-atoms-have-different-isotopes

Jun 6, 2014 ... Atoms have different isotopes because the number of neutrons in the nucleus of the atom varies. The number of protons in an atom of an ...

digipac.ca/chemical/molemass/isotopes.htm

Isotopes. Most atoms have several naturally occurring isotopes (click here for a list of elements that have no isotopes). An isotope is an atom which contains a ...

www.britannica.com/science/radioactive-isotope

Apr 5, 2016 ... Radioactive isotope, also called radioisotope, radionuclide, or radioactive nuclide, any of several species of the same chemical element with ...