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Heisenberg’s uncertainty principle
it is impossible to measure at the same time both the velocity and position of an electron
orbital
a region in space within which there is a high probability of finding an electron.
Aufbau Principle
When building up the electron configuration of an atom in its ground state, the electrons occupy the lowest available energy levels
Hund’s rule of maximum capacity
when two or more orbitals of equal energy are available, the electrons occupy them singly before filling them up in pairs.
Pauli Exclusion principle
no more than two electrons may occupy an orbital and they must have opposite spins
Energy levels
fixed energy value that an electron may have
