- 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 ½, and a mass of 1.673 × 10−27 kg. Symbol: P
Origin of proton
Examples from the Web for protons
The gravity is enough to squeeze atoms until electrons combine with protons to make neutrons.The Weirdest Object in the Universe
Matthew R. Francis
May 18, 2014
We have electrons and protons of matter, and photons of light.The Black Star Passes
John W Campbell
One funny move out of you and I'll blast your ship into protons!On the Trail of the Space Pirates
They clearly understood the combination of these electrons and protons into atoms.Skylark Three
Edward Elmer Smith
In Arret the protons were negative, and the electrons positive.Devil Crystals of Arret
Hal K. Wells
That makes the total number of protons and electrons the same.Letters of a Radio-Engineer to His Son
- a stable, positively charged elementary particle, found in atomic nuclei in numbers equal to the atomic number of the element. It is a baryon with a charge of 1.602176462 × 10 –19 coulomb, a rest mass of 1.672 62159 × 10 –27 kilogram, and spin 1/2
Word Origin and History for protons
1920 in physics, coined by English physicist Ernest Rutherford (1871-1937) from noun use of Greek proton, neuter of protos "first" (see proto-), on analogy of electron; supposedly because hydrogen was hypothesized as a constituent of all the elements. The word was used earlier in embryology (1893) as a translation of German anlage ("fundamental thing") based on Aristotle's phrase he prote ousia to proton.
- A stable, positively charged subatomic particle in the baryon family having a mass 1,836 times that of the electron.
- A stable subatomic particle in the baryon family having a mass of 1.672 X 10-24 grams (1,836 times that of the electron) and a positive electric charge of approximately 1.602 X 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.