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atomic nucleus |
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atomic nucleus [ə′täm·ik ′nü·klē·əs] (astronomy) Atomic nucleus The central region of an atom. Atoms are composed of negatively charged electrons, positively charged protons, and electrically neutral neutrons. The protons and neutrons (collectively known as nucleons) are located in a small central region known as the nucleus. The electrons move in orbits which are large in comparison with the dimensions of the nucleus itself. Protons and neutrons possess approximately equal masses, each roughly 1840 times that of an electron. The number of nucleons in a nucleus is given by the mass number A and the number of protons by the atomic number Z. Nuclear radii r are given approximately by r = 1.2 × 10-15 m A1/3. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| He would use this idea to formulate a theory of the atomic nucleus, but he was stumped about how to go further. An ordinary atomic nucleus contains positively charged protons, while its antimatter counterpart contains negatively charged antiprotons. Unobserved, for example, an electron exists as a wave - which is actually a multidimensional mathematical equation describing its probable location around an atomic nucleus. |
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