Chapter_7e-Tayseer

Chapter_7e-Tayseer - Chapter 7e Sections 7.8 7.9 Electron...

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Chapter 7e Sections 7.8, 7.9 Electron Configurations: Like Parking at the Mall?
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Electron Spin and Magnetism If we consider the electron a sphere we can spin it two ways : N S S N N S clockwise counterclockwise Spinning a charged particle creates a magnetic field
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Magnetic Spin (m ): The 4 Quantum Number N S S N The spin of an electron is quantized!! 2 1 + 2 1 -
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Parking Spaces for Electrons Pauli Exclusion Principle No two electrons in an atom can have the same set of 4 No two electrons in an atom can have the same set of 4 quantum #’s quantum #’s This means: No atomic orbital may have more than 2 electrons No atomic orbital may have more than 2 electrons He: (2 e-) n = 1 n = 1 l = 0 m l = 0 m s = +1/2 m l = 0 l = 0 m s = -1/2
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Atomic Orbitals: The Parking Lot 1. Each shell or principal level of quantum number n 2
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Parking the Electrons Ground state: lowest energy arrangement of e - in an atom Aufbau principle place the electrons in the lowest energy orbitals first place the electrons in the lowest energy orbitals first (park your car as close to the mall as possible) Hunds Rule : the most stable arrangement of electrons in the most stable arrangement of electrons in subshells is the one with the greatest number of subshells is the one with the greatest number of parallel spins parallel spins . .
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Electron Configurations Orbital Diagram (arrow designation) He: He: 1 s 2 s 2 p 1 2 s n # of e - in these orbitals orbital type ( ) Power designation
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Electron Configurations: H -- Ne 1 s 2 s 2 p H: O: F: Ne: He: Li: Be: B: C: N:
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