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TeachMeFinance.com - explain Radium (Ra) Radium (Ra) The term 'Radium (Ra)' as it applies to the area of nuclear science can be defined as ' A radioactive metallic element with atomic number 88. As found in nature, the most common isotope has a mass number of 226. It occurs in minute quantities associated with uranium in pitchblende, camotite, and other minerals. '. Previous 5 Terms: Radionuclide Radiopharmaceutical radioscope Radiosensitivity radiosonde Next 5 Terms: Radius radius of a circle Radius of Maximum Winds Radon Radon (Rn) 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.