The Pauli Exclusion Principle No two electrons in an atom can have the same set of four quantum numbers.
We assumed opposite spin orientations – spins are _. He atoms, with two electrons, are diamagnetic. H atoms, each has a single electron, they are paramagnetic – when an external magnetic field is applied, the electron magnets align with the field. Substances with unpaired electrons are _. 
_: substance is attracted to a magnetic field. Complete description of electrons requires _ quantum numbers. ms, _ quantum number, = +1/2 and -1/2. Understand the fundamental physical properties of the elements and their periodic trends. 
Write the electron configuration for elements and monoatomic ions.
Understand effective nuclear charge and its role in determining atomic properties. Atomic Electron Configurations and Chemical Periodicity Goals: Understand the role magnetism plays in determining and revealing atomic structure.
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