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noun Physics, Chemistry.
a positively charged elementary particle that is a fundamental constituent of all atomic nuclei. It is the lightest and most stable baryon, having a charge equal in magnitude to that of the electron, a spin of 1/2, and a mass of 1.673 × 10−27 kg. Symbol: P
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Protons
is always a great word to know.
So is flibbertigibbet. Does it mean:
| a fool or simpleton; ninny. |
| a chattering or flighty, light-headed person. |
Example Sentences
- In this oxidation, a molecule of hydrogen gas is ionized to two electrons and two protons.
- Unfortunately hadrons, such as protons and antiprotons, are made of smaller bits called quarks.
- For a nucleus to spin at all, the total number of protons and neutrons it contains must be odd.
American Heritage
Science Dictionary
proton  (prō'tŏn') Pronunciation Key
A stable subatomic particle in the baryon family having a mass of 1.672 × 10-24 grams (1,836 times that of the electron) and a positive electric charge of approximately 1.602 × 10-19 coulombs. Protons make up part of the nucleus of all atoms except hydrogen, whose nucleus consists of a single proton. In neutral atoms, the number of protons is the same as the number of electrons. In positively charged atoms, the number of protons is greater than the number of electrons, and in negatively charged atoms electrons outnumber protons. Protons are believed to be composed of two up quarks and one down quark. See Table at subatomic particle. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
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