CAS CH 102 Lecture Notes - Lecture 29: Principal Quantum Number, Pauli Exclusion Principle, Angular Momentum
Document Summary
4 #s in wave mechanical model: principal quantum number (n); energy levels. N = 1 (least energy), 2, 3, etc. # of shapes is limited by principal quantum : magnetic quantum # (ml) Number of spatial orientations of orbitals: spin quantum # (ms) Spin of electrons in two possible directions. Each orbital can hold two e- with opposite spins. Pauli exclusion principle: no two electrons can have the same set of quantum numbers. Aufbau principle: the e- occupies the lowest energy orbital (s, p, d, f) that can receive it. Hund"s rule of maximum multiplicity: electrons are paired when one e- fills all orbitals. Periodic law: the properties of elements are a periodic function of their atomic numbers. Metals on the left side of the chart: most active is on lower left corner due to many valence shells, react with water to form bases.
