Chap 8 Sect 1, 2, & 3

Chap 8 Sect 1 2, - 8.1 Development of the Periodic Table Earlier chemists recognized there were patterns of relationships between elements 1870

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Chap 8 Sect 1, 2, & 3 notes F09.doc Page 1 8.1 Development of the Periodic Table Earlier chemists recognized there were patterns of relationships between elements. 1870 Mendleev put together a periodic table by putting atoms with similar physical and chemical properties in groups. Predicted the properties of an element which had not yet been found. The only mistake was putting the elements in order of atomic . Crucial point: The shape of the periodic table is actually dictated by the of atoms as determined by the quantum numbers we found in Chapter 7. This is because the electronic structure also dictates chemical and physical properties.
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Chap 8 Sect 1, 2, & 3 notes F09.doc Page 2 8.2 Electron Spin and the Pauli Principle Fourth quantum number - m s = spin on an electron. m s = + 1/2 or – 1/2 Pauli Exclusion Principle “In a given atom, no two electrons can have the same set of four quantum numbers ( n , l , m l , m s ).” Therefore , an orbital can hold only two , and they must have In the atom there is only one electron.
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This note was uploaded on 04/06/2010 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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Chap 8 Sect 1 2, - 8.1 Development of the Periodic Table Earlier chemists recognized there were patterns of relationships between elements 1870

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