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In atomic theory and quantum mechanics, an atomic orbital is a mathematical function that describes the wave-like behavior of either one electron or a pair of electrons in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus. The term atomic orbital may also refer to the physical region or space where the electron can be calculated to be present, as defined by the particular mathematical form of the orbital.

### Electron properties

### History

### Orbital names

### Hydrogen-like orbitals

### Quantum numbers

### Shapes of orbitals

### Orbital energy

### Electron placement and the periodic table