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Radioactive decay - Wikipedia
WebRadioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation.A material containing unstable nuclei is considered radioactive.Three of the most common types of decay are alpha decay (α-decay), beta decay (β-decay), and …
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Chemical element - Wikipedia
WebA chemical element is a species of atoms that have a given number of protons in their nuclei, including the pure substance consisting only of that species. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by any chemical reaction.The number of protons in the nucleus is the defining property of an …
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Radiocarbon dating - Wikipedia
WebIn nature, carbon exists as three isotopes, two stable, nonradioactive: carbon-12 (12 C), and carbon-13 (13 C), and radioactive carbon-14 (14 C), also known as "radiocarbon".The half-life of 14 C (the time it takes for half of a given amount of 14 C to decay) is about 5,730 years, so its concentration in the atmosphere might be expected to decrease over …
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Rock (geology) - Wikipedia
WebGeology is the study of Earth and its components, including the study of rock formations. ... Plutonism was developed as a theory during this time, and the discovery of radioactive decay in 1896 allowed for the radiocarbon dating of rocks. Understanding of plate tectonics developed in the 20th century. Classification
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Earth - Wikipedia
WebBecause much of the heat is provided by radioactive decay, scientists postulate that early in Earth's history, before isotopes with short half-lives were depleted, Earth's heat production was much higher. ... Local differences in topography, geology, ... The Kármán line, defined as 100 km (62 mi) above Earth's surface, is a working definition ...
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A List of Radioactive Elements - ThoughtCo
WebJul 30, 2019 · This is a list or table of elements that are radioactive. Keep in mind, all elements can have radioactive isotopes. If enough neutrons are added to an atom, it becomes unstable and decays. A good example of this is tritium, a radioactive isotope of hydrogen naturally present
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What is Radiation? - Definition, Causes & Effects - Study.com
WebSep 22, 2021 · Radiation is the dispersal of energy from a body through waves or particles. Learn the causes and effects of radiation, the difference between ionizing and non-ionizing radiation, and explore the ...
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Isotope Definition and Examples in Chemistry - ThoughtCo
WebFeb 04, 2020 · Bismuth-209 is a stable radioactive isotope that undergoes alpha-decay but has a half-life of 1.9 x 10 19 years (which is more than a billion times longer than the estimated age of the universe). Tellurium-128 undergoes beta-decay with a half-life estimated to be 7.7 x 10 24 years.
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Radionuclide - Wikipedia
WebThe radioactive decay can produce a stable nuclide or will sometimes produce a new unstable radionuclide which may undergo further decay. Radioactive decay is a random process at the level of single atoms: it is impossible to predict when one particular atom will decay. ... In geology, archaeology, and paleontology, natural radionuclides are ...
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Extremophile - Wikipedia
WebAn extremophile (from Latin extremus meaning "extreme" and Greek philiā (φιλία) meaning "love") is an organism that is able to live (or in some cases thrive) in extreme environments, i.e. environments that make survival challenging such as due to extreme temperature, radiation, salinity, or pH level.. These organisms are ecologically dominant in the …
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