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  • 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 theory | Definition, Scientists, History, Facts | Britannica
    The modern atomic theory, which has undergone continuous refinement, began to flourish at the beginning of the 19th century with the work of the English chemist John Dalton
  • Atom | Definition, Structure, History, Examples, Diagram, Facts . . .
    Chemical elements are made up of only one type of atom—gold contains only gold atoms, and neon contains only neon atoms--and they are ranked in order of their atomic number (the total number of protons in its nucleus) in a chart called the periodic table
  • Atom - Development, Theory, Structure | Britannica
    Democritus developed his atomic philosophy as a middle ground between two opposing Greek theories about reality and the illusion of change He argued that matter was subdivided into indivisible and immutable particles that created the appearance of change when they joined and separated from others
  • 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
  • Atomic physics and its applications | Britannica
    A broad field, atomic physics has applications in the study of condensed matter, gases, chemical-reaction mechanisms, atmospheric science, lasers, nuclear physics, and the arrangement of elements in the periodic table
  • Atomic mass | Definition, Units, Facts | Britannica
    Atomic mass, the quantity of matter contained in an atom of an element It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units In this scale, 1 atomic mass unit (amu) corresponds to 1 66 x 10^−24 gram
  • Atomic weight | Definition, Units, Table | Britannica
    The atomic weight of helium is 4 002602, the average that reflects the typical ratio of natural abundances of its isotopes Atomic weight is measured in atomic mass units (amu), also called daltons See below for a list of chemical elements and their atomic weights
  • Atomic number | Definition Facts | Britannica
    There are 118 elements on the periodic table The elements are arranged in order of increasing atomic number, which is the number of protons in that atom’s nucleus Hydrogen, the element with the lowest atomic number, has 1 proton; oganesson, the element with the highest atomic number, has 118
  • Thomson atomic model | Description, Plum Pudding, Image | Britannica
    Thomson atomic model, earliest theoretical description of the inner structure of atoms, proposed about 1900 by William Thomson (Lord Kelvin) and strongly supported by Sir Joseph John Thomson, who had discovered (1897) the electron, a negatively charged part of every atom





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