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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 are willing to just simply accept the nucleus is unstable due to a ... The nucleus of an atom undergoing radioactive decay splits into two ...

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.answers.com/Q/What_happens_to_the_atomic_nuclei_of_unstable_isotopes_during_radioactive_decay

There are three types of radioactive decay, alpha, beta and gamma. Alpha decay is when an unstable, or radioactive, nucleus gives off an alpha particle, which ...

www.bbc.co.uk/schools/gcsebitesize/science/triple_edexcel/ionising_radiation/radioactive_decay/revision/1

Back. Next. The nuclei of some isotopes are unstable and emit radiation. ... isotopes. Unstable nuclei split up in a process called radioactive decay and emit radioactive radiation. ... A = atomic mass (number of protons + neutrons). Z = atomic ...

www.dummies.com/education/science/chemistry/the-process-of-natural-radioactive-decay

Certain naturally occurring radioactive isotopes are unstable: Their nucleus breaks apart, ... The radioactivity corresponds to the neutron/proton ratio in the atom:.

www2.lbl.gov/abc/Basic.html

Mar 30, 2007 ... Nuclear Structure | Radioactivity | Alpha Decay | Beta Decay |Gamma ... The number of protons in the nucleus, Z, is called the atomic number. ... are approximately 270 stable isotopes, and more than 2000 unstable isotopes.

www.chemteam.info/Radioactivity/WS-Radioactivity1-Ans.html

3) The amount of time for half the atoms in a radioactive sample to decay is called ... 4) The process in which the nuclei of unstable atoms can become more stable ... 23) The half-life of a given isotope can be altered by heat, pressure, or some ...

education.seattlepi.com/list-three-types-radiation-given-off-during-radioactive-decay-5856.html

The theory states that an atomic nucleus consists of two subatomic particles: ... uranium isotopes are unstable, causing them to decay and produce radiation.