Accessed 24 Sep. 2020. The term “isotope” mainly refers to the variation in the atomic massor weight of an element. Send us feedback. The simplest, commonest form of hydrogen has a nucleus that consists of a single proton; it is the only atom with no neutrons: its mass number is 1. Due to the unequal numbers of neutrons, the isotopes of elements usually have a different mass. These are uranium-234, uranium-235, and uranium-238. When an element's atoms have different numbers of neutrons they are said to be isotopes of that element. Radioactive isotopes may also be classified as stable isotopes when their half-lives are too long to be measured. See the full definition for isotope in the English Language Learners Dictionary, Nglish: Translation of isotope for Spanish Speakers, Britannica English: Translation of isotope for Arabic Speakers, Britannica.com: Encyclopedia article about isotope. Learn a new word every day. 'Arrive At' vs. 'Arrive To': A Very Nerdy Analysis, In order to judge how people felt, the senator's office hired a firm to take a. These are uranium-234, uranium-235, and uranium-238. An isotope with 6 protons and 7 neutrons is carbon-13 or C-16.

A third form of hydrogen known as tritium has one proton and two neutrons: its mass number is 3. The mass of a neutron is almost identical to that of a proton. A rarer form of hydrogen known as deuterium has one proton and one neutron: its mass number is 2. Isotope definition is - any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties. Are We Entering 'Uncharted' or 'Unchartered' Waters? Carbon atoms exist naturally with 6, 7 or 8 neutrons.

Carbon-14 is unstable, decaying with a half-life of about 5,700 years. What made you want to look up isotope? A… Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Note the mass number of two isotopes may be the same, even though they are different elements. Chemistry Dictionary | Birth of the Elements | Tools | Periodic Table | Citing Chemicool | About | Privacy | Contact. Drew Fowler, migratory game bird research scientist with the Wisconsin Department of Natural Resources, dedicated a portion of his presentation to, Most were contaminated with radium-226, an, This paper hypothesized a supernova occurring between 163 and 326 light-years away, based on globally elevated levels of Iron-60, a radioactive, At Lake Dojran, researchers used sediment levels of a lithium, Post the Definition of isotope to Facebook, Share the Definition of isotope on Twitter. Both are formally given an atomic mass number, A, of 1. For example, there are a lot of carbon atoms in the universe.

However, there are also exceptions like carbon, helium, and beryllium. Can you spell these 10 commonly misspelled words? Chemical and Physical Properties of Isotopes. The normal ones are carbon-12.

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