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- Pauli exclusion principle
- The statement that no two electrons in an atomThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. can have the same set of four quantum numbers; the principle leads to the rule that only two electrons (having opposite spin) can occupy an atomic orbitalA mathematical function from which electron density around an atom can be calculated. A region in an atom within which there is a high probability that a particular electron will be found..