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  • Atom | Definition, Structure, History, Examples, Diagram, Facts . . .
    Atom, smallest unit into which matter can be divided without the release of electrically charged particles It also is the smallest unit of matter that has the characteristic properties of a chemical element As such, the atom is the basic building block of chemistry
  • Subatomic particle | Definition, Examples, Classes | Britannica
    Subatomic particle, any of various self-contained units of matter or energy that are the fundamental constituents of all matter They include electrons, protons, neutrons, quarks, muons, and neutrinos, as well as antimatter particles such as positrons
  • atomic particles - Students | Britannica Kids | Homework Help
    Today all the matter in the universe is viewed as being composed of three kinds of elementary atomic particles: (1) particles called quarks, which make up neutrons and protons; (2) particles called leptons, which include electrons and some similar particles; and (3) particles called bosons, or vector mesons, which include the photons seen as
  • Atomic physics | Structure, Particles Energy | Britannica
    atomic physics, the scientific study of the structure of the atom, its energy states, and its interactions with other particles and with electric and magnetic fields Atomic physics has proved to be a spectacularly successful application of quantum mechanics, which is one of the cornerstones of modern physics
  • Subatomic particle - 4 Forces, Quarks, Leptons | Britannica
    They describe each basic force as being in a sense carried by its own subatomic particles These “force” particles are now called gauge bosons, and they differ from the “matter” particles—the quarks and leptons discussed earlier—in a fundamental way
  • Atomic theory | Definition, Scientists, History, Facts | Britannica
    Atomic theory, ancient philosophical speculation that all things can be accounted for by innumerable combinations of hard, small, indivisible particles (called atoms) of various sizes but of the same basic material; or the modern scientific theory of matter according to which the chemical elements
  • The discovery of subatomic particles | Britannica - Encyclopedia Britannica
    subatomic particle, or elementary particle, Any of various self-contained units of matter or energy Discovery of the electron in 1897 and of the atomic nucleus in 1911 established that the atom is actually a composite of a cloud of electrons surrounding a tiny but heavy core
  • Atom - Quantum Mechanics, Subatomic Particles, Electrons | Britannica
    Atom - Quantum Mechanics, Subatomic Particles, Electrons: Within a few short years scientists developed a consistent theory of the atom that explained its fundamental structure and its interactions
  • Atomic model | Definition, History, Development, Examples, Facts . . .
    Atomic model, in physics, a model used to describe the structure and makeup of an atom Atomic models have gone through many changes over time, evolving as necessary to fit experimental data For a more in-depth discussion of the history of atomic models, see atom: development of atomic theory
  • Subatomic particle - Quarks, Leptons, Bosons | Britannica
    Subatomic particle - Quarks, Leptons, Bosons: While electroweak theory allows extremely precise calculations to be made, problems arise with the theory of the strong force, quantum chromodynamics (QCD), despite its similar structure as a gauge theory





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