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In chemistry, an atomic orbital is the region in which an electron may be found around a single atom. ... Chemistry (from Greek Ïημεία khemeia meaning alchemy, see below for possible origins of this word) is the science of matter at the atomic to molecular scale, dealing primarily with collections of atoms (such as molecules, crystals, and metals). ... Electron atomic and molecular orbitals In quantum chemistry (electronic structure theory), the molecular electronic states, i. ... Electron atomic and molecular orbitals In atomic physics and quantum chemistry, the electron configuration is the arrangement of electrons in an atom, molecule or other body. ... Electron atomic and molecular orbitals, showing a Pi-bond at the bottom right of the picture In chemistry, pi bonds (Ï bonds) are bonds with a single nodal plane containing the line segment between the two atoms. ... Electron atomic and molecular orbitals, showing among others the sigma bond of two s-orbitals and a sigma bond of two p-orbitals In chemistry, sigma bonds (Ï-bonds) are bonds where there is no nodal plane containing the line segment between the two bonded species. ... The Aufbau principle (also Aufbau rule or building-up principle), is used to determine the electron configuration of an atom, molecule or ion. ...