Definitions for Protonˈproʊ tɒn

This page provides all possible meanings and translations of the word Proton

Random House Webster's College Dictionary

pro•tonˈproʊ tɒn(n.)

  1. a positively charged elementary particle found in all atomic nuclei, the lightest and most stable of the baryons, and having a positive charge of 1.602 x 1019 coulombs: the number of protons in an atom equals that element's atomic number.

    Category: Physics

Origin of proton:

1915–20; n. use of Gk prôton, neut. of prôtosfirst


Princeton's WordNet

  1. proton(noun)

    a stable particle with positive charge equal to the negative charge of an electron


  1. proton(Noun)

    A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element; the nucleus of the most common isotope of hydrogen; composed of two up quarks and a down antiquark

  2. Origin: From πρῶτον, neuter of πρῶτος


  1. Proton

    The proton is a subatomic particle with the symbol p or p+ and a positive electric charge of 1 elementary charge. One or more protons are present in the nucleus of each atom. The number of protons in each atom is its atomic number. The name proton was given to the hydrogen nucleus by Ernest Rutherford in 1920, because in previous years he had discovered that the hydrogen nucleus could be extracted from the nuclei of nitrogen by collision, and was thus a candidate to be a fundamental particle and building block of nitrogen, and all other heavier atomic nuclei. In the modern Standard Model of particle physics, the proton is a hadron, composed of quarks. Prior to that model becoming a consensus in the physics community, the proton was considered a fundamental particle. In the modern view, a proton is composed of three valence quarks: two up quarks and one down quark. The rest masses of the quarks are thought to contribute only about 1% of the proton's mass. The remainder of the proton mass is due to the kinetic energy of the quarks and to the energy of the gluon fields that bind the quarks together. Because the proton is not a fundamental particle, it possesses a physical size—although this is not perfectly well-defined since the surface of a proton is somewhat fuzzy, due to being defined by the influence of forces that do not come to an abrupt end. The proton is about 1.6–1.7 fm in diameter.

Anagrams of Proton

  1. pronto

Translations for Proton

Kernerman English Multilingual Dictionary


a particle with a positive electrical charge, forming part of the nucleus of an atom.

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