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
Chemistry For Dummies Cheat Sheet: Chemical bonding basics, energy levels and orbitals, digging the mole concept, identifying isotopes through representations, common measurement conversions, basic acids and bases of chemistry, and combined and ideal gas laws.
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