Unstable angina or sometimes referred to as acute coronary syndrome causes unexpected chest pain, and usually occurs while resting. Key Areas Covered. It is also known as radioactive decay, nuclear decay, nuclear disintegration, or radioactive disintegration. What are Stable Isotopes – Definition, Properties, Applications 2. Radioactivity is the spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction. Find 70 ways to say unstable, along with antonyms, related words, and example sentences at Thesaurus.com, the world's most trusted free thesaurus. Unstable patients will have many of these symptoms, while a stable patient may present with only one or two subtle symptoms. The most reactive metal that has a stable isotope is cesium, which is located directly above francium on the periodic table. Emulsion, in physical chemistry, mixture of two or more liquids in which one is present as droplets, of microscopic or ultramicroscopic size, distributed throughout the other. The rate of this step – and therefore, the rate of the overall substitution reaction – depends on the activation energy for the process in which the bond between the carbon and the leaving group breaks and a carbocation forms. What are Unstable Isotopes – Definition… Transition-state theory, treatment of chemical reactions that regards them as proceeding by a continuous change in the relative positions and potential energies of the constituent atoms and molecules. The difference between the transition and the initial state energies are related to the reaction’s activation energy. Stability of carbocation intermediates. 1. ; The most reactive metal is francium, the last alkali metal (and most expensive element).However, francium is an unstable radioactive element, only found in trace amounts. We know that the rate-limiting step of an S N 1 reaction is the first step - formation of the this carbocation intermediate. stable in Chemistry topic From Longman Dictionary of Contemporary English stable sta‧ble 1 / ˈsteɪb ə l / W3 AWL adjective 1 CHANGE/BECOME DIFFERENT NOT MOVING steady and not likely to move or change OPP unstable → stability A wide base will make the structure much more stable. The most reactive element is fluorine, the first element in the halogen group. In chemistry, chemical stability is the thermodynamic stability of a chemical system.. Thermodynamic stability occurs when a system is in its lowest energy state, or in chemical equilibrium with its environment. Unstable definition: You can describe something as unstable if it is likely to change suddenly , especially if... | Meaning, pronunciation, translations and examples Emulsions are formed from the component liquids either spontaneously or, more often, by mechanical means. Unstable definition: You can describe something as unstable if it is likely to change suddenly , especially if... | Meaning, pronunciation, translations and examples The main difference between stable and unstable isotopes is that stable isotopes have stable nuclei whereas unstable isotopes have unstable nuclei.
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