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Although most of the known elements have at least one isotope whose atomic nucleus is stable indefinitely, all elements have isotopes that are unstable and disintegrate, or decay, at measurable rates by emitting radiation.
- 11.3: Stable and Unstable Isotopes
Recognize that radioactivity is a signature of unstable...
- 11.3: Stable and Unstable Isotopes
Recognize that radioactivity is a signature of unstable nuclide - radioisotopes. Describe a radioisotope. Explain how the stability of isotopes depends on the composition of its nucleus. Use the "band of stability" to identify stable isotopes.
6 Αυγ 2017 · Isotopes can be divided mainly into two groups as stable isotopes and unstable isotopes. The main difference between stable and unstable isotopes is that stable isotopes have stable nuclei whereas unstable isotopes have unstable nuclei.
Unstable isotopes most commonly emit alpha particles (He 2+) and electrons. Neutrons, protons, and positrons can also be emitted and electrons can be captured to attain a more stable atomic configuration (lower level of potential energy ) through a process called radioactive decay.
19 Αυγ 2022 · Atoms with the same number of protons but different numbers of neutrons are called isotopes. They share almost the same chemical properties, but differ in mass and therefore in physical properties. There are stable isotopes, which do not emit radiation, and there are unstable isotopes, which do emit radiation.
There are two main types of isotopes: stable and unstable (radioactive). There are 254 known stable isotopes. All artificial (lab-made) isotopes are unstable and therefore radioactive; scientists call them radioisotopes.
Isotopes may be stable or unstable. The unstable isotopes are also called radio-isotopes and will decay over time into another isotope of the same or a different element. The stable isotopes of each element and their mass numbers appear on each element cell of the Table in a pie chart, where each mass number is indicated
