12-quantum - Quantum Mechanics Q u a n tu m N u m b e r s P...

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1 Week 5 CHEM 1310 - Sections L and M 1 Quantum Mechanics Quantum Numbers Pauli Exclusion Principle Aufbau Principle Hund’s Rule Valence Electrons Periodic Table Trends Ionization Energy Electron Affinity Atomic Radii Week 5 CHEM 1310 - Sections L and M 2 Pauli Exclusion Principle In an atom, no two e - can have the same set of quantum #’s. n l m l m s Week 5 CHEM 1310 - Sections L and M 3 Aufbau Principle Electrons add one by one to atomic orbitals to build up ” from lower to higher energy states. orbitals Each orbital can hold 2 e -
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2 Week 5 CHEM 1310 - Sections L and M 4 Aufbau Principle Electrons add one by one to atomic orbitals to build up ” from lower to higher energy states. “s” subshell can hold only 2 e - “p” subshell can hold up to 6 e - Only 2 e - in the 2p subshell Week 5 CHEM 1310 - Sections L and M 5 Hund’s Rule When several orbitals are of equal energy, a single e - enters each orbital before a second e - enters. 6
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12-quantum - Quantum Mechanics Q u a n tu m N u m b e r s P...

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