Aufbau principle

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A topic a little better known than average, read and translated beyond its own country.

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Notion

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Science and technology

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What Wikipedia says

In atomic physics and quantum chemistry, the Aufbau principle (pronounced , from German: Aufbauprinzip, lit. 'building-up principle'), also called the Aufbau rule, states that in the ground state of an atom or ion, electrons first fill subshells of the lowest available energy, then fill subshells of higher energy.

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