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what are the three rules that govern the filling of atomic orbitals by electrons
Rule 1. aufbau rule - energy levels filled so lowest energy level filled first. Rule 2. pauli exclusion principle - maximum of 2 electrons may be placed in each energy level. Provided the spins of electrons are of opposite sign. Rule 3. hunds rule - when energy levels are equal one electron is added to each energy level in turn with their spins unpaired until each energy level has one electron.
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