niels bohr said in an atom electrons are located in energy levels.
niels bohr said in an atom electrons are located in energy levels.
who said in an atom electrons are located in energy levels?
niels bohr
according to the quantum theory of the hydrogen atom proposed by niels bohr in 1913, an atom can have only certain energy levels. absorption or emission of a particle of light or photon corresponds to a transition between two possible energy levels, and the photon energy equals the difference between their two energies. on dividing by hc, the photon wavenumber equals the difference between two "terms", each equal to an energy divided by hc or an "energy in wavenumber units" (cm). energy levels of atoms and molecules are today described by term symbols which indicate their quantum numbers.
rydberg–ritz combination principle
molecular orbital diagrams are diagrams of molecular orbital (mo) energy levels, shown as short horizontal lines in the center, flanked by constituent atomic orbital (ao) energy levels for comparison, with the energy levels increasing from the bottom to the top. lines, often dashed diagonal lines, connect mo levels with their constituent ao levels. degenerate energy levels are commonly shown side by side. appropriate ao and mo levels are filled with electrons by the pauli exclusion principle, symbolized by small vertical arrows whose directions indicate the electron spins. the ao or mo shapes themselves are often not shown on these diagrams. for a diatomic molecule, an mo diagram effectively shows the energetics of the bond between the two atoms, whose ao unbonded energies are shown on the sides. for simple polyatomic molecules with a "central atom" such as methane () or carbon dioxide (), a mo diagram may show one of the identical bonds to the central atom. for other polyatomic molecules, an mo diagram may show one or more bonds of interest in the molecules, leaving others out for simplicity. often even for simple molecules, ao and mo levels of inner orbitals and their electrons may be omitted from a diagram for simplicity.
molecular orbital diagram