What are 'energy levels'? Explain the arrangement and distribution of electrons in the various shells with reference to an atom in general and to an atom of potassium (3919K' with special reference to the 2n2 rule.
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Viewed simply, electrons are arranged in shells around an atom's nucleus. Electrons closest to the nucleus will have the lowest energy. Electrons further away from the nucleus will have higher energy. An atom's electron shell can accommodate 2n2 electrons (where n is the shell level).
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An atom’s electrons exist in discrete atomic orbitals, and the atom’s electron configuration can be determined using a set of guidelines
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