Chemistry A-Level
shielding and distance
What shielding and distance means in Chemistry A-Level, as defined for AQA.
Definition of shielding and distance
Check what you remember
Read the wording for your board, then hide it and explain shielding and distance in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The outer pair of electrons lies further from the nucleus and is shielded by more inner shells, and these effects outweigh the extra protons.
Topics that use shielding and distance
- Group 2, the alkaline earth metals (AQA A-Level)
Related terms
- alkalinity of the product
- barium sulfate precipitate
- cold water versus steam
- First ionisation energy
- Group 2 sulfate solubility
- hydroxide solubility
- increasing reactivity down the group
- metallic bonding and melting point
Using shielding and distance in the exam
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