Teoria y Estructura Atómica

Teoría Atómica: Bohr and the Beginnings of Quantum Theory

por Adrian Dingle, B.Sc., Anthony Carpi, Ph.D.

  • Términos que usted debe saber
    • anion : a negatively charged ion; an atom that has more electrons than protons
    • cation : a positively charged ion; an atom that has more protons than electrons
    • electronic : pertaining to electrons
    • emit : give off; send forth
    • spectrum (plural: spectra) : a continuing range such as of color or frequency; a series of colors arranged by wavelength as in a rainbow
  • Visible spectrum
    Figure 2: The visible light spectrum is displayed at the top and line spectra for three elements - hydrogen, neon, and iron - are below. image © Neon spectrum: Deo Favente
    Figure 3: Niels Bohr

    Punto de Comprensión

    The planetary model of the atom was based on

    Punto de Comprensión

    In an atom, the ground state is the orbital with the ______ potential energy.

    Cation and anion
    Figure 4: Using the element hydrogen, examples of a cation and anion. image © Jkwchui

    Punto de Comprensión

    _____ have a positive charge, while _____ have a negative charge.

    Atomic structure_carl
    Figure 5: Artistic model of an atom showing the nucleus, with protons and neutrons, and orbiting electrons. image © Visionlearning

    Punto de Comprensión

    A _____ is a heavy particle that has no charge.

    Carbon 14
    Figure 6: Carbon isotopes. Each have the same number of protons, but different numbers of neutrons.

    Punto de Comprensión

    Isotopes are atoms of the same element that have a different


    The 20th century brought a major shift in our understanding of the atom, from the planetary model that Ernest Rutherford proposed to Niels Bohr’s application of quantum theory and waves to the behavior of electrons. With a focus on Bohr’s work, the developments explored in this module were based on the advancements of many scientists over time and laid the groundwork for future scientists to build upon further. The module also describes James Chadwick’s discovery of the neutron. Among other topics are anions, cations, and isotopes.

    Conceptos Clave

    • Drawing on experimental and theoretical evidence, Niels Bohr changed the paradigm of modern atomic theory from one that was based on physical particles and classical physics, to one based in quantum principles.

    • Under Bohr’s model of the atom, electrons cannot rotate freely around the atom, but are bound to certain atomic orbitals that both constrain and define an atom's electronic behavior.

    • Atoms can gain or lose electrons to become electrically charged ions.

    • James Chadwick completed the early picture of the atom with his discovery of the neutron, a neutral, nuclear particle that affects an atom’s mass and the different physical properties of atomic isotopes.

    • NGSS
    • HS-C4.4, HS-C6.2, HS-PS1.A1, HS-PS1.A3
    • Referencias
    • Bohr, N. (1913). On the Constitution of Atoms and Molecules. Philosophical Magazine (London), Series 6 (26), 1–25.

    • Chadwick, J. (1932). The Possible Existence of a Neutron. Nature, 129(3252), 312.
    • Dalton, John (1805). On the Absorption of Gases by Water and Other Liquids. Memoirs of the Literary and Philosophical Society of Manchester, Series 2(1), 271–287.
    • Einstein, A. (1905). A New Determination of Molecular Dimensions. Annalen der Physik, Series 4(19), 289–306.
    • Einstein, A. (1905). Does the inertia of a body depend on its energy content? Annalen der Physik, Series 4(18), 639–641.
    • Einstein, A. (1905). On the electrodynamics of moving bodies. Annalen der Physik, Series 4(17), 891–921.
    • Einstein, A. (1905). On a heuristic viewpoint concerning the production and transformation of light. Annalen der Physik, Series 4(17), 132–148.
    • Einstein, A. (1905). On the motion of small particles suspended in liquids at rest required by the molecular-kinetic theory of heat. Annalen der Physik, Series 4(19), 371–381.
    • Planck, M. (1903). Treatise on Thermodynamics. Ogg, A. (trans.). London: Longmans, Green & Co.

    Adrian Dingle, B.Sc., Anthony Carpi, Ph.D. “Teoría Atómica” Visionlearning Vol. CHE-1 (3), 2003.