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.
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.
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.
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.
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.
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.
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.
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.
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.
Californium (Cf) has several isotopes, of which the most notable are: 1. **Californium-252 (Cf-252)**: This isotope is one of the most prominent, with a half-life of about 2.645 years. It is a powerful neutron emitter and is used in various applications, including neutron radiography, chemotherapy, and as a neutron source in scientific research.
Calcium has several isotopes, which are variants of the element that have the same number of protons but different numbers of neutrons. The isotopes of calcium are: 1. **Calcium-40 (⁴⁰Ca)** - The most abundant and stable isotope, making up about 97% of naturally occurring calcium. It has 20 protons and 20 neutrons.
Caesium (Cs) has several isotopes, with the most stable and commonly known ones being: 1. **Cs-133**: This is the most stable isotope of caesium and is used as the standard for the definition of the second in the International System of Units (SI). Cs-133 has a half-life of stable, meaning it does not undergo radioactive decay.
Cadmium (Cd) has several isotopes, with the most stable and common ones being: 1. **Cadmium-106 (Cd-106)**: This isotope is stable and has a natural abundance of about 1.25%. 2. **Cadmium-108 (Cd-108)**: Also stable, this isotope has an abundance of about 0.89%. 3. **Cadmium-110 (Cd-110)**: Another stable isotope, it comprises roughly 12.
Bromine has several isotopes, but the two most notable ones are: 1. **Bromine-79 (Br-79)**: This is the most stable and abundant isotope of bromine, making up about 50.5% of naturally occurring bromine. It has a half-life that is stable (not radioactive), and it consists of 35 protons and 44 neutrons.
Boron has two stable isotopes and several unstable isotopes. The two stable isotopes of boron are: 1. **Boron-10 (¹⁰B)**: This isotope has 5 protons and 5 neutrons, and it constitutes about 19.9% of naturally occurring boron. It is often used in applications such as neutron capture therapy for treating cancer and in various nuclear applications.
Bohrium (Bh) is a synthetic element with the atomic number 107. It was first synthesized in 1981 and is named after the physicist Niels Bohr. Currently, several isotopes of bohrium have been produced, but they are all radioactive and have relatively short half-lives. The most notable isotopes of bohrium include: 1. **Bohrium-262 (Bh-262)**: This isotope has a half-life of about 5.6 milliseconds.