What Is Afbou principal ?
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The Aufbau principle, simply put, means electrons are added to orbitals as protons are added to an atom. The Aufbau principle outlines the rules used to determine how electrons organize into shells and subshells around the atomic nucleus. Electrons go into the subshell having the lowest possible energy.
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The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied.
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