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Ch 4 Section 18

Electron Configurations

The wave function for an atom simultaneously depends on/describes all the electrons in the atom
Aufbau principle Each atom is built up by 1. adding the appropriate #s of protons and neutrons in the nucleus as specified by the atomic # & mass #, and 2. adding the necessary number of electrons into orbitals in the way that gives the lowest total energy for the atom
Pauli Exclusion principle No 2 electrons in an atom may have identical sets of 4 quantum numbers.
Hund’s Rule Electrons occupy all the orbitals of a given subshell singly before pairing begins. These unpaired electrons have parallel spins.
Paramagnetism and Diamagnetism Because 2 electrons in the same orbital must be paired, it is possible to calculate the number of orbitals and the number of electrons in each n shell. The number of orbitals per n level is given by n2. The maximum number of electrons per n level is 2n
Created by: tilleryc