electron configuration
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An electron configuration is the way electrons are arranged in the different shells surrounding an atom's nucleus. Understanding how electrons are positioned in these shells matters because it determines how atoms behave chemically and interact with other atoms.
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Electron atomic and molecular orbitals A Bohr diagram of lithium
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s 2s 2p, meaning that the 1s, 2s, and 2p subshells are occupied by two, two, and six electrons, respectively.