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Lecture 20: Polyelectronic Atoms
Lecture 20: Polyelectronic Atoms

... • For polyelectronic (i.e. real) atoms, a direct solution of the Schrodinger Equation is not possible. (Can’t solve the 3 body motion problem; Z12.61) • When we construct polyelectronic atoms, we use the hydrogen-atom orbital nomenclature to discuss in which orbitals the electrons reside. • This is ...
Chemistry Week 04 - nchsdduncanchem1
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... No two electrons in an atom have the same set of four quantum numbers. Hund's Rule: Electrons will enter empty orbitals of equal energy, when they are available. Quantum Chemistry: Describes the way atoms combine to form molecules and the way molecules interact with one another, using the rules of q ...
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Section 4.2 The Quantum Model of the Atom

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... e) period 4 transition element that forms a 3+ diamagnetic ion. (Scandium) f) period 5 element that forms 3+ ion with a “pseudo-rare-gas” configuration. (Indium) g) whose ground state electron configuration is [Ne]3s23p2. (Silicon) h) ground state electron configuration is [Kr]5s24d6. (Ruthenium) i) ...
Chemistry ~ Fall Final Review
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國立屏東教育大學95學年度研究所碩士班入學考試
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... 1. If matter is uniform throughout, cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a (an) __________. (A) heterogeneous mixture (B) element (C) homogeneous mixture (D) compound (E) mixture of elements 2 ...
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... ___20) The ground-state configuration for the atoms of a transition element ___21) The ground-state configuration of a negative ion of a halogen ___22) The ground-state configuration of a common ion of an alkaline earth element Use these answers for questions 23-25. (1) Heisenberg uncertainty princi ...
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Quantum Numbers, Orbitals, Electron Configurations, Periodic Trends

... How many significant figures are in each of the following numbers? a) 34.02 c) 10.50 e) 1.2340 × 107 b) 3300 d) 0.00342 f) 12340000 Convert the numbers is questions 1a – 1d into scientific notation. a) c) b) d) Convert the following numbers that are in scientific notation into decimal form. a) 1.234 ...
Quantum Numbers, Orbitals, Electron Configurations, Periodic Trends
Quantum Numbers, Orbitals, Electron Configurations, Periodic Trends

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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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