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Aufbau chart - Electron Energy Level Configuration Diagram  like the virtues, first you start with a basic virtue, then once you're solid with that virtue you start practicing a higher, dependent virtue and keep practicing and mastering the fundamental virtues

Stable atoms have as many electrons as they do protons. How do these electrons orient themselves around the nucleus? They fill their electron orbitals by the aufbau principle.: The Aufbau Principle - Using the Aufbau Principle