BRAINCAKEEnergy Levels
Electrons in different shells have different amounts of energy (shells).
Each shell or energy level is given a principal quantum number from n = 1 to n = 7.
The number of electrons that can exist in each shell or energy level is 2n2
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Key terms in this lesson
- Principal quantum number
- The number (n = 1, 2, 3...) given to an electron shell, indicating its energy level and distance from the nucleus.
More in Atomic Structure
- Mass Spectra of Elements
- Low Resolution Mass Spectrometry
- Mass Spectrometer in Space
- Quantum Mechanics
- Atomic Orbitals
- Order of filling orbitals
- Electron Configuration
- First Ionisation Energy
All 22 lessons in Atomic Structure · All AQA AS-level Chemistry topics