2018年6月14日 · Nucleus Mass Usually, what makes an isotope unstable is the large nucleus. If a nucleus becomes larger enough from the number of neutrons, since the neutron count is what makes isotopes, it will be unstable and will try to 'shed' its neutrons and/or protons in order to achieve stability. Emitting neutrons/protons as well as gamma radiation is the radioactivity. …

2015年2月10日 · Stable isotopes are chemical isotope that are not radioactive. Larger atomic elements or elements with a non one-to-one proton to neutron ration can have unstable isotopes with exceptions for elements with "a magic number" of neutrons.

2014年1月11日 · Only 90 isotopes are expected to be perfectly stable, and an additional 163 are energetically unstable, but have never been observed to decay. Thus, 253 isotopes are stable by definition. The rate at which a radioactive isotope decays is measured by its half-life — the time it takes for one-half of the nuclei of a radioactive material to ...

2015年11月3日 · Isotope vs. Radioisotope An Isotope is an atom of an element with a different number of neutrons than the original element. EX * : Carbon usually has 6 neutrons. An Isotope of carbon would be carbon 13. This atom is an isotope because it has 7 neutrons instead of 6. A Radioisotope is also an isotope by nature. The difference is that radioisotopes are very …

2014年7月25日 · Most isotopes become stable by emitting alpha particles, beta particles, positrons, or gamma rays. A few become stable by electron capture or by spontaneous fission. ALPHA PARTICLES An alpha particle is a helium nucleus. The heavier elements usually decay by alpha emission. For example, ""_92^238"U" → _90^234"Th" + _2^4"He" BETA PARTICLES …

2014年2月25日 · The nucleus is unstable if the neutron-proton ratio is less than 1:1 or greater than 1.5. > At close distances, a strong nuclear force exists between nucleons. This attractive force comes from the neutrons. More protons in the nucleus need more neutrons to bind the nucleus together. The graph below is a plot of the number of neutrons versus the number of …

2024年6月7日 · A lot of the natural occurring isotopes are stable, such as those of smaller elements. The bigger an atom is, the more unstable its isotopes may be (not an absolute rule, though). It is harder to ...

2014年2月20日 · The graph below is a plot of the number of neutrons versus the number of protons in various stable isotopes. The stable nuclei are in the pink band known as the belt of stability They have a neutron/proton ratio between 1:1 and 1.5:1. NUMBER OF NUCLEONS. As the nucleus gets bigger, the electrostatic repulsions between the protons gets weaker.

What is stable and unstable isotopes? Stable isotopes are isotopes that do not undergo radioactive decay and have constant atomic mass. Unstable isotopes, also known as radioactive isotopes, decay ...

2024年6月14日 · Phosphorus is stable in its common forms, such as white phosphorus and red phosphorus. However, there are unstable isotopes of phosphorus that are radioactive and undergo decay.