ISCI 101 Week 5
ISCI 101 Week 5 ISCI 101
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This 1 page Class Notes was uploaded by Charles Miller on Thursday October 6, 2016. The Class Notes belongs to ISCI 101 at James Madison University taught by Tom Devore in Fall 2016. Since its upload, it has received 3 views. For similar materials see Physics, Chemistry, and the Human Experience in Science at James Madison University.
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Date Created: 10/06/16
Week 5 Quantum Theory The spectrum is produced when an electron moves from one energy state to another The basic idea of the old quantum theory is that the motion in an atomic system is quantized, or discrete. The system obeys classical mechanics except that not every motion is allowed, only those motions which obey the old quantum condition Energy is absorbed when it moves from a state of lower energy to one of higher energy. Energy is released when it moves form a state of higher to a state of lower energy. The electron configurations explain why the periodic table is organized In the manner that it is. The current model of the atom is based on the Quantum Theory Several concepts from the Bohr model remain The discrete energy states in the atom are represented by the 4 quantum numbers Each set of quantum numbers represents 1 electron The total number of electrons a shell can hold is 2n^2 The electrons are distributed into subshells o Each subshell holds 2(2l+1) electrons o The S subshell can hold 2 electrons o The P subshell can hold 6 electrons o The D subshell can hold 10 electrons o The F subshell can hold 14 electrons Hund’s Rule o For a given electron configuration, the term with maximum multiplicity has the lowest energy. The multiplicity is equal to , where is the total spin angular momentum for all electrons. Therefore, the term with lowest energy is also the term with the maximum S o As put by the professor “the highest spin wins”
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