1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5 is the full electron configuration of bromine (br) so that all the subshells in each principal energy shell are grouped together.
What is electron configuration?
The electron configuration of an atom or molecule (or other physical structure) in atomic or molecular orbitals is defined in atomic physics and quantum chemistry. The electron configuration of the neon atom, for example, is 1s2 2s2 2p6, which means that the 1s, 2s, and 2p subshells are occupied by 2, 2, and 6 electrons, respectively. Each electron in an orbital moves independently in an average field created by all other orbitals, according to electronic configurations. Configurations are mathematically described by Slater determinants or configuration state functions.
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