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TeachMeFinance.com - explain Nucleus Nucleus The term 'Nucleus' as it applies to the area of nuclear science can be defined as ' The small, central, positively charged region of an atom. Except for the nucleus of ordinary hydrogen, which has only a proton, all atomic nuclei contain both protons and neutrons. The number of protons determines the total positive charge or atomic number. This number is the same for all the atomic nuclei of a given chemical element. The total number of neutrons and protons is called the mass number. '. The term 'Nucleus' as it applies to the area of basic science can be defined as 'Physical science: central region of an atom, which contains more than 99% of the atom's mass'. The term 'Nucleus' as it applies to the area of gnome research can be defined as 'The cellular organelle in eukaryotes that contains most of the genetic material'. Previous 5 Terms: Nuclear waste Nucleic acid Nucleolar organizing region Nucleon Nucleotide Next 5 Terms: nucleus Nuclide NUG numbat number line About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.