Related Experiment Video

Updated: Dec 25, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

9.1K

Energy Levels and SpectSSrum of Neutral Helium (4He I)

William C Martin

    Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
    |March 21, 2020
    PubMed

    More Related Videos

    High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy10:40

    High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

    Published on: June 28, 2016

    7.9K
    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures08:53

    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

    Published on: October 9, 2012

    18.0K

    Related Concept Videos

    Nuclear Binding Energy02:13

    Nuclear Binding Energy

    The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons are bound...
    14.5K
    Emission Spectra02:39

    Emission Spectra

    When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
    75.2K
    The Bohr Model02:18

    The Bohr Model

    Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as the...
    79.7K
    The Pauli Exclusion Principle03:06

    The Pauli Exclusion Principle

    The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
    58.5K
    The Aufbau Principle and Hund's Rule03:02

    The Aufbau Principle and Hund's Rule

    To determine the electron configuration for any particular atom, we can build the structures in the order of atomic numbers. Beginning with hydrogen, and continuing across the periods of the periodic table, we add one proton at a time to the nucleus and one electron to the proper subshell until we have described the electron configurations of all the elements. This procedure is called the aufbau principle, from the German word aufbau (“to build up”). Each added electron occupies the...
    71.6K
    Electron Configuration of Multielectron Atoms03:26

    Electron Configuration of Multielectron Atoms

    The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
    63.7K