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mass number |
Also found in: Dictionary/thesaurus, Medical, Legal, Acronyms, Wikipedia, Hutchinson | 0.03 sec. |
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mass number, often represented by the symbol A, the total number of nucleons (neutrons and protons) in the nucleus of an atom atom [Gr.,=uncuttable (indivisible)], basic unit of matter ; more properly, the smallest unit of a chemical element having the properties of that element.
Structure of the Atom..... Click the link for more information. . All atoms of a chemical element element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means of a chemical reaction, but no further simplification can be achieved. ..... Click the link for more information. have the same atomic number (number of protons in the nucleus) but may have different mass numbers (from having different numbers of neutrons in the nucleus). Atoms of an element with the same mass number make up an isotope isotope (ī`sətōp) ..... Click the link for more information. of the element. Different isotopes of the same element cannot have the same mass number, but isotopes of different elements often do have the same mass number, e.g., carbon-14 (6 protons and 8 neutrons) and nitrogen-14 (7 protons and 7 neutrons). |
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students are individuals and not a mass number to be given the same test and evaluated en mass with the same standards. They predict a stronger deformation and even greater stability for a nucleus with atomic number 108 and mass number 270. Corporations are at a huge risk of becoming the next victim of these aggressive lawsuit efforts by the recording industry because of the potential mass number of users downloading illegal files from the same corporate IP address. |
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mass number
