protium

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protium

the most common isotope of hydrogen, having a mass number of 1
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

protium

[′prōd·ē·əm]
(nuclear physics)
The lightest hydrogen isotope, having a mass number of 1 and consisting of a single proton and electron. Also known as light hydrogen.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.