Children: Isotopes
Cerium (Ce) is a chemical element with atomic number 58 and belongs to the lanthanide series. It has several isotopes, which are variants of the element with the same number of protons but a different number of neutrons. The isotopes of cerium are: 1. **^136Ce** - Stable isotope with 78 neutrons. 2. **^138Ce** - Stable isotope with 80 neutrons.
Chromium has several isotopes, which are variants of the element with the same number of protons but different numbers of neutrons. The most notable isotopes of chromium are: 1. **Chromium-50 (⁵⁰Cr)**: This is the most abundant isotope, making up about 4.3% of natural chromium. It has 24 protons and 26 neutrons.
Cobalt has several isotopes, but the most notable ones are: 1. **Cobalt-59 (^59Co)** - This is the only stable isotope of cobalt, making up nearly 100% of naturally occurring cobalt. It has 27 protons and 32 neutrons. 2. **Cobalt-60 (^60Co)** - This is a radioactive isotope with a half-life of about 5.27 years.
Copernicium (Cn) is a synthetic element with the atomic number 112. It is a member of the group 10 elements in the periodic table. As of now, there are currently a few known isotopes of copernicium, but all are highly unstable and radioactive. The most notable isotopes of copernicium include: 1. **Copernicium-277 (\(^{277}\)Cn)**: This isotope has a half-life of about 0.
Curium (Cm) is an actinide element with atomic number 96. It has several isotopes, with the most notable being: 1. **Curium-242 (Cm-242)**: This is the most stable isotope of curium and has a half-life of about 162.8 days. It decays primarily by alpha emission. 2. **Curium-244 (Cm-244)**: This isotope has a half-life of approximately 18.
Darmstadtium is a synthetic element with the symbol Ds and atomic number 110. It is part of the transactinide series of elements and was first synthesized in 1994. As of now, darmstadtium has no stable isotopes; all of its isotopes are radioactive.
Dubnium (Db) is a synthetic element with the atomic number 105. It has several known isotopes, most of which are highly radioactive and have relatively short half-lives. The most studied isotopes of dubnium include: 1. **Dubnium-263 (Db-263)**: This is the most stable isotope of dubnium, with a half-life of about 34 seconds. It decays primarily through alpha decay.
Dysprosium has several isotopes, but the most notable ones are: 1. **Dysprosium-156 (Dy-156)**: This is the most abundant stable isotope of dysprosium, making up about 5.3% of natural dysprosium. 2. **Dysprosium-158 (Dy-158)**: Another stable isotope, it accounts for approximately 0.1% of natural dysprosium.
Einsteinium (Es) is a synthetic element with the atomic number 99. It has several isotopes, the most notable of which are: 1. **Einsteinium-253 (Es-253)**: This is the most stable isotope of einsteinium, with a half-life of about 20.5 days. It is produced in nuclear reactors and is used in research.
Europium (Eu) has a number of isotopes, but the most significant ones are Europium-151 and Europium-153, which are the only naturally occurring isotopes. 1. **Europium-151 (Eu-151)**: This isotope has an atomic mass of approximately 150.9198 u and has a natural abundance of about 47.8%. It is stable and does not undergo radioactive decay.
Fermium (Fm) is a synthetic element with the atomic number 100. It is part of the actinide series in the periodic table. Isotopes of fermium are all radioactive, as fermium has no stable isotopes. The most notable isotopes of fermium include: 1. **Fermium-257 (Fm-257)**: This is the most stable isotope of fermium, with a half-life of about 100.5 days.
Flerovium (Fl) is a synthetic element with atomic number 114, and it is part of the superheavy elements in the periodic table. As of my last knowledge update in October 2023, there are very few known isotopes of flerovium, primarily because it is extremely unstable and has a short half-life.
Fluorine has one stable isotope, which is fluorine-19 (¹⁹F). This isotope accounts for nearly all naturally occurring fluorine. Fluorine-19 has 9 protons and 10 neutrons in its nucleus. In addition to the stable isotope, fluorine has several radioactive isotopes, though they are not found in significant amounts in nature.
Francium is a highly radioactive alkali metal with the symbol Fr and atomic number 87. It is one of the least stable elements on the periodic table, and it has no stable isotopes. The isotopes of francium are all radioactive, and the most commonly discussed isotopes are: 1. **Francium-223 (Fr-223)**: This is the most stable and the most naturally occurring isotope of francium, with a half-life of about 22 minutes.
Gadolinium (Gd) is a lanthanide element with atomic number 64 and has several isotopes. The most common isotopes of gadolinium include: 1. **Gadolinium-152 (Gd-152)**: This isotope has a natural abundance of about 0.14% and is stable. 2. **Gadolinium-154 (Gd-154)**: A stable isotope with a natural abundance of approximately 2.17%.
Gallium has two stable isotopes, which are: 1. **Gallium-69 (¹⁶⁹Ga)**: This isotope has 39 neutrons and is the more abundant of the two stable isotopes, comprising about 60.11% of natural gallium. 2. **Gallium-71 (¹⁷¹Ga)**: This isotope has 41 neutrons and makes up about 39.89% of naturally occurring gallium.