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atoms    音标拼音: ['ætəmz]
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  • Atom | Definition, Structure, History, Examples, Diagram, Facts . . .
    An atom is the 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
  • 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
  • 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 Crucial to the development of the theory was new evidence indicating that light and matter have both wave and particle characteristics at the atomic and subatomic levels Theoreticians had objected
  • Periodic table | Definition, Elements, Names, Symbols, Groups, Charges . . .
    Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number When the elements are thus arranged, there is a recurring pattern in which elements in the same column (group) have similar properties
  • Bohr model | Description, Hydrogen, Development, Facts | Britannica
    The Bohr model is a description of the structure of atoms proposed in 1913 by the Danish physicist Niels Bohr The Bohr model of the atom, a radical departure from earlier, classical descriptions, was the first to incorporate quantum theory and was the predecessor of wholly quantum-mechanical models
  • Rutherford model | Definition, Description, Image, Facts | Britannica
    Rutherford model, description of the structure of atoms proposed (1911) by the New Zealand-born physicist Ernest Rutherford The model described the atom as a tiny, dense, positively charged core called a nucleus, around which the light, negative constituents, called electrons, circulate at some distance
  • Atom - Development, Theory, Structure | Britannica
    Atom - Development, Theory, Structure: The concept of the atom that Western scientists accepted in broad outline from the 1600s until about 1900 originated with Greek philosophers in the 5th century bce Their speculation about a hard, indivisible fundamental particle of nature was replaced slowly by a scientific theory supported by experiment and mathematical deduction It was more than 2,000
  • Chemical bonding - Visualization, Atoms, Molecules | Britannica
    Chemical bonding - Visualization, Atoms, Molecules: The last opposition to the existence of atoms vanished in the early 20th century when techniques were developed that portrayed visual representations of atoms The first such techniques made use of the diffraction of X-rays, where the pattern of interference between rays that are reflected by a crystal can be interpreted in terms of the
  • atom - Students | Britannica Kids | Homework Help
    Atoms also join together chemically to form molecules Matter is made up of molecules, atoms, and ions (electrically charged atoms or groups of atoms), so atoms are basic components of matter
  • How Scientists Discovered Atoms | Britannica
    Learn about the discovery of atoms and the instruments scientists use to see these small particles





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