Presentation5_061002

Presentation5_061002 - Chem 6A Presentation #5 Overview...

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Chem 6A Presentation #5 2006-10-02 1 Overview Chapter 1: The Quantum World Electron spin Orbital energies and shielding Building up electron configurations
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2 Atomic orbitals and quantum numbers An atomic orbital is specified by 3 quantum numbers: n , , and m . n : energy level or shell ℓ: distinguishes the different sublevels or subshells ℓ = 0: s sublevel ℓ = 1: p sublevel ℓ = 2: d sublevel ℓ = 3: f sublevel m : orientation of orbital in space Each sublevel is designated by combining the value of n with the letter designation, e.g., “2 s ”, “3 d
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3 Atomic orbitals and quantum numbers ℓ = 0: s sublevel ℓ = 1: p sublevel ℓ = 2: d sublevel ℓ = 3: f sublevel
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4 s orbitals: l = 0
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5 p orbitals: l = 1 m can be -1, 0, or +1
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6 d orbitals: l = 2 m can be -2, -1, 0, +1, or +2
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7 f orbitals: l = 3 m can be -3, -2, -1, 0, +1, +2, or +3
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8 Orbital energies in a hydrogen atom Energy of an orbital in the H atom depends only on the principal quantum number n .
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9 Chemical periodicity and electron configuration Dmitri Mendeleev, 1870: arranged elements into a periodic table. His periodic law: when arranged by atomic mass, elements show recurrence of chemical properties. In a modern periodic table, elements are arranged according to ________.
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10 Chemical periodicity and electron configuration The model of the arrangement of electrons in an atom based on the Schrödinger
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Presentation5_061002 - Chem 6A Presentation #5 Overview...

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