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en.wikipedia.org/wiki/Radioactive_decay

Radioactive decay is the process by which an unstable atomic nucleus loses energy by ..... Radioactive decay is seen in all isotopes of all elements of atomic number 83 (bismuth) or greater. Bismuth, however, is only very slightly radioactive, ...

www.quora.com/What-happens-to-the-atomic-nuclei-of-unstable-isotopes-during-radioactive-decay

If you really want to understand what happens in the atomic nuclei of unstable ... The nucleus of an atom undergoing radioactive decay splits into two (or on rare occasions, three) pieces which are the nuclei of two other and ...

www.answers.com/Q/What_happens_to_the_atomic_nuclei_of_unstable_isotopes_during_radioactive_decay

The rate of radioactivity decay for each unstable radioactivity isotope is ... Describe the process of radioactive decay in which the unstable nucleus of a ...

www.reference.com/science/happens-atomic-nuclei-unstable-isotopes-during-radioactive-decay-59d7e6d10deb79f

In every instance where an unstable isotope undergoes radioactive decay, one or more atoms with a different number of protons than the decaying atom are ...

www.iop.org/resources/topic/archive/radioactivity/index.html

Radioactive decay occurs in unstable atomic nuclei – that is, ones that don't ... The half-life of a radioactive isotope is the time after which, on average, half of the  ...

www.arpansa.gov.au/understanding-radiation/what-is-radiation/ionising-radiation/radioactivity

This radiation is emitted when the nucleus undergoes radioactive decay and is converted into a different isotope which may, according to its number of neutrons and protons, be either ... Atoms found in nature are either stable or unstable.

www.ansto.gov.au/NuclearFacts/AboutNuclearScience/Radioactivity/index.htm

Some atoms are stable while others are unstable and decay, emitting ... When an atom decays, it changes into another isotope, or form, of the ... In beta decay, a particle is emitted from the nucleus of an atom.

www.nde-ed.org/EducationResources/HighSchool/Radiography/radioactivity.htm

Atoms with unstable nuclei are constantly changing as a result of the ... Radioactivity is the release of energy and matter that results from changes in the nucleus ...

www.thoughtco.com/why-radioactive-decay-occurs-608649

Mar 13, 2017 ... Radioactive decay occurs because an atom's atomic nucleus isn't stable, due ... imbalance in the number of protons and neutrons in the atomic nucleus. ... Radioisotopes with a short half-life are called unstable radioisotopes.