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In mathematics, an isotopy from a possibly non-associative algebra A to another is a triple of bijective linear maps (a, b, c) such that if xy = z then a(x)b(y) = c(z).This is similar to the definition of an isotopy of loops, except that it must also preserve the linear structure of the algebra.
A nuclide is a species of an atom with a specific number of protons and neutrons in the nucleus, for example, carbon-13 with 6 protons and 7 neutrons. The nuclide concept (referring to individual nuclear species) emphasizes nuclear properties over chemical properties, whereas the isotope concept (grouping all atoms of each element) emphasizes chemical over nuclear.
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds. [1]
In the physical sciences, to do with chemical isotopes In mathematics, to do with a relation called isotopy; see Isotopy (disambiguation) In geometry, isotopic refers to facet-transitivity
For other isotopes, the isotopic mass is usually within 0.1 u of the mass number. For example, 35 Cl (17 protons and 18 neutrons) has a mass number of 35 and an isotopic mass of 34.96885. [ 7 ] The difference of the actual isotopic mass minus the mass number of an atom is known as the mass excess , [ 8 ] which for 35 Cl is –0.03115.
Winter brings less daylight and colder temperatures, which can disrupt sleep. Seasonal Affective Disorder (SAD) is more common in winter due to the lack of sunlight, causing sleep disturbances.
On Sunday, 179 people were killed as a plane touched down in South Korea, making it the deadliest plane crash in South Korea's history.. Two of the six Jeju Air crew members are the only survivors ...
Isotopes are never separated in the periodic table; they are always grouped together under a single element. When atomic mass is shown, it is usually the weighted average of naturally occurring isotopes; but if no isotopes occur naturally in significant quantities, the mass of the most stable isotope usually appears, often in parentheses. [8]
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