Chemistry A-Level
shells and energy levels
What shells and energy levels means in Chemistry A-Level, as defined for AQA.
Definition of shells and energy levels
Check what you remember
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Reference: AQA
The electrons occupy shells around the nucleus, held by electrostatic attraction between their negative charge and the positive nucleus.
Topics that use shells and energy levels
- Fundamental particles (AQA A-Level)
Related terms
- electrostatic attraction
- First ionisation energy
- nuclear atom
- Orbital
- relative mass
- Atomic Number (Z)
- discovery of the neutron
- electrical neutrality
Using shells and energy levels in the exam
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