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A proton is a stable subatomic particle, symbol p, H +, or 1 H + with a positive electric charge of +1 e (elementary charge).Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio).
Alternately, the atomic mass of a carbon-12 atom may be expressed in any other mass units: for example, the atomic mass of a carbon-12 atom is 1.992 646 882 70 (62) × 10 −26 kg. As is the case for the related atomic mass when expressed in daltons , the relative isotopic mass numbers of nuclides other than carbon-12 are not whole numbers, but ...
One dalton is approximately the mass of one a single proton or neutron. [2] The unified atomic mass unit has a value of 1.660 538 921 (73) × 10 −27 kg. [3] The amu without the "unified" prefix is an obsolete unit based on oxygen, which was replaced in 1961.
The mass-to-charge ratio (m/Q) is a physical quantity relating the mass (quantity of matter) and the electric charge of a given particle, expressed in units of kilograms per coulomb (kg/C). It is most widely used in the electrodynamics of charged particles , e.g. in electron optics and ion optics .
For example, the mass of an unbound atom of the common hydrogen isotope (hydrogen-1, protium) is 1.007 825 032 241 (94) Da, [a] the mass of a proton is 1.007 276 466 5789 (83) Da, [7] the mass of a free neutron is 1.008 664 916 06 (40) Da, [8] and the mass of a hydrogen-2 (deuterium) atom is 2.014 101 778 114 (122) Da. [9]
Baryonic matter consists of quarks and particles made from quarks, like protons and neutrons. Free neutrons have a half-life of 613.9 seconds. Electrons and protons appear to be stable, to the best of current knowledge. (Theories of proton decay predict that the proton has a half life on the order of at least 10 32 years. To date, there is no ...
proton mass 1.672 621 925 95 (52) × 10 −27 kg: 3.1 × 10 −10 [30] neutron mass 1.674 927 500 56 (85) × 10 −27 kg: 5.1 × 10 −10 [31] / proton-to-electron mass ratio: 1 836.152 673 426 (32) 1.7 × 10 −11 [32] / W-to-Z mass ratio: 0.881 45 (13) 1.5 × 10 −4 [33]
For in natural (Planck) units, the strength of gravity simply is what it is, a primary quantity, while the proton's mass is the tiny number 1/13 quintillion. [ 21 ] While it is true that the electrostatic repulsive force between two protons (alone in free space) greatly exceeds the gravitational attractive force between the same two protons ...