Chemistry A-Level
shielding and deshielding
What shielding and deshielding means in Chemistry A-Level, as defined for AQA.
Definition of shielding and deshielding
Check what you remember
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Reference: AQA
A nucleus never feels the whole applied field because the electrons around it circulate and shield it, while anything that pulls electron density away leaves the nucleus less shielded.
Topics that use shielding and deshielding
- Nuclear magnetic resonance spectroscopy (A-level only) (AQA A-Level)
Related terms
- assignment from the Data Booklet
- electron-withdrawing neighbours
- from evidence to structure
- independence of field strength
- integration ratios
- the n+1 rule
- carbon environments
- combining techniques
Using shielding and deshielding in the exam
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