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Filling of Electronic States - usual filling sequence: 1s 2s
Filling of Electronic States - usual filling sequence: 1s 2s

pdf file - UTEP Computer Science
pdf file - UTEP Computer Science

... • After Ne, we start filling the third layer (n = 3). In our simplified description, we expect to see 2n2 = 18 elements on this level, but in reality, electrons add smoothly to the third level only until we reach Ar (Z = 18). Then, for K (Z = 19), instead of further filling the third level, electrons s ...
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Copyright The McGraw-Hill Companies, Inc

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... changing energy states, a photon would be emitted with energy equal to that change Bohr (1913) argued that perhaps electrons in the atom may also behave in this way. Electrons don’t radiate with just any energy, but rather must do so in a quantised fashion. He developed the following theory of the a ...
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Electron configuration



In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 2p6.Electronic configurations describe electrons as each moving independently in an orbital, in an average field created by all other orbitals. Mathematically, configurations are described by Slater determinants or configuration state functions.According to the laws of quantum mechanics, for systems with only one electron, an energy is associated with each electron configuration and, upon certain conditions, electrons are able to move from one configuration to another by the emission or absorption of a quantum of energy, in the form of a photon.Knowledge of the electron configuration of different atoms is useful in understanding the structure of the periodic table of elements. The concept is also useful for describing the chemical bonds that hold atoms together. In bulk materials, this same idea helps explain the peculiar properties of lasers and semiconductors.
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