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Promethium (61Pm) is an artificial element, except in trace quantities as a product of spontaneous fission of 238U and 235U and alpha decay of 151Eu, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes.All the isotopes of promethium are unstable; the longest-lived is promethium-145 (17.7-year half-life). Excluding nuclear isomers, a total of 38 radioactive isotopes of promethium are known. They range in mass from 126 to 163. The least stable isotope, promethium-128, has a half-life of one second.Physical properties
Promethium is a silver-white metal with a melting point of 1,160°C (2,120°F) and no measured boiling point. Its density is 7.2 grams per cubic centimeter. The physical properties of promethium are of less interest to scientists than its radioactive properties. The Andromeda galaxy.
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| Promethium | |
|---|---|
| Mass number | [145] |
| Promethium in the periodic table |
| Nuclide | Z | Decay mode |
|---|---|---|
| Excitation energy | ||
| 30P | 15 | β+ |
| 31P | 15 | Stable |
| 32P | 15 | β− |
Table of Contents
Is promethium stable or unstable?
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| Promethium | |
|---|---|
| Mass number | [145] |
| Promethium in the periodic table |
How many stable isotopes does promethium have?
All the isotopes of promethium are unstable; the longest-lived is promethium-145 (17.7-year half-life). Excluding nuclear isomers, a total of 38 radioactive isotopes of promethium are known. They range in mass from 126 to 163. The least stable isotope, promethium-128, has a half-life of one second.
Stable environmental isotopes and the delta notation
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What properties does promethium have?
Physical properties
Promethium is a silver-white metal with a melting point of 1,160°C (2,120°F) and no measured boiling point. Its density is 7.2 grams per cubic centimeter. The physical properties of promethium are of less interest to scientists than its radioactive properties. The Andromeda galaxy.
Is P 30 stable or unstable?
| Nuclide | Z | Decay mode |
|---|---|---|
| Excitation energy | ||
| 30P | 15 | β+ |
| 31P | 15 | Stable |
| 32P | 15 | β− |
Why is technetium promethium unstable?
The most stable neutron to proton ratio increases as atoms gain mass, changing from a 1:1 ratio for light elements to more like a 1.3:1 ratio for heavier elements. In the cases of technetium and the next lightest radioactive element (promethium), there is no combination of protons and neutrons that balances out.
What is special about technetium and promethium?
Technetium, with atomic number (denoted Z) 43, is the lowest-numbered element in the periodic table that is exclusively radioactive. The second-lightest, exclusively radioactive element, promethium, has an atomic number of 61.
What are the isotopes of promethium?
| Isotope | Decay | |
|---|---|---|
| abundance | mode | |
| 145Pm | trace | ε |
| 146Pm | syn | ε |
| β− |
See some more details on the topic Does promethium have stable isotopes? here:
Promethium – Wikipedia
Promethium is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only …
Promethium: To Strive, to Seek, to Find and Not to Yield
Promethium (Pm) is well-known as the only element in the lanthanide series of the periodic table with no stable isotopes (Burke, 2019); it …
Promethium
Promethium has one semi-stable isotope (145), it is a soft beta emitter; it does not emit gamma rays, but beta particles impinging on elements of high …
Promethium – Element information, properties and uses – The …
Promethium’s longest-lived isotope has a half-life of only 18 years. For this reason it is not found naturally on Earth. It has been found that a star in …
What group number is promethium in?
| Group | Lanthanides | Melting point |
|---|---|---|
| Period | 6 | Boiling point |
| Block | f | Density (g cm−3) |
| Atomic number | 61 | Relative atomic mass |
| State at 20°C | Solid | Key isotopes |
Is promethium the strongest metal?
Superman flies off to his Fortress of Solitude, where the analysis reveals that Metallo contains promethium, the “strongest metal known to man,” according to the analysis. They could use the radioactive signature of promethium to track Metallo.
What kind of element is promethium?
Promethium is a chemical element with symbol Pm and atomic number 61. Classified as a lanthanide, Promethium is a solid at room temperature.
How many valence electrons does promethium have?
…
Promethium Atomic and Orbital Properties.
| Atomic Number | 61 |
|---|---|
| Electron Configuration | [Xe] 4f5 6s2 |
| Valence Electrons | 4f5 6s2 |
| Oxidation State | 2;3 |
Is promethium a transition metal?
The period 6 inner transition metals (lanthanides) are cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).
Stable and unstable isotopes
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Which elements have no stable isotopes?
Isotopes per element. Of the known chemical elements, 80 elements have at least one stable nuclide. These comprise the first 82 elements from hydrogen to lead, with the two exceptions, technetium (element 43) and promethium (element 61), that do not have any stable nuclides.
How do you determine stable isotopes?
Nuclear Stability is a concept that helps to identify the stability of an isotope. The two main factors that determine nuclear stability are the neutron/proton ratio and the total number of nucleons in the nucleus.
What is considered a stable isotope?
A stable isotope is one that does not emit radiation, or, if it does its half-life is too long to have been measured. It is believed that the stability of the nucleus of an isotope is determined by the ratio of neutrons to protons.
Does technetium have any stable isotopes?
All the isotopes of technetium are radioactive. It is one of two elements with Z < 83 that have no stable isotopes; the other element is promethium (Z = 61).
Why technetium has no stable isotopes?
Technetium can only be produced artificially because most forms or isotopes of it (atoms of the same chemical element with different numbers of neutrons) have an excess of neutrons, making it very unstable.
What is the most stable isotope of technetium?
Technetium’s most stable isotope, technetium-98, has a half-life of about 4,200,000 years. It decays into ruthenium-98 through beta decay.
How many electrons does promethium have?
Promethium atoms have 61 electrons and the shell structure is 2.8. 18.23.
What is the reactivity of promethium?
Reaction of promethium with water
However, one would predict that the silvery white metal promethium is quite electropositive and would react slowly with cold water and quite quickly with hot water to form promethium hydroxide, Pm(OH)3, and hydrogen gas (H2).
How many protons does promethium have?
Is promethium radioactive element?
Promethium is very radioactive and emits beta radiation, according to Lenntech. According to Chemicool, metallic promethium is silvery white, and the salts glow in the dark with a pale blue or green light.
What Are Radioactive Isotopes? | Properties of Matter | Chemistry | FuseSchool
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Is promethium a synthetic element?
synthetic elements, in chemistry, radioactive elements that were not discovered occurring in nature but as artificially produced isotopes. They are technetium (at. no. 43), which was the first element to be synthesized, promethium (at.
What is promethium worth?
Promethium-147 is available at a cost of about 50c/Ci.
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