BRAINCAKEElectronegativity
Electronegativity is the ability of a bonded atom to attract the pair of electrons in a covalent bond.
The Pauling scale used is from 0 - 4. T Electronegativity decreases down the group.
Because of their high electronegativities they are oxidising agents. and are able to gain electrons to form negative ions. Electronegativity decreases because:
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Key terms in this lesson
- Shielding
- The repulsion of outer electrons by electrons in inner shells, which reduces the net attraction of the nucleus for the outer electrons.
- Covalent bond
- A strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms.
- Oxidising agent
- A species that accepts electrons from another species, causing that species to be oxidised.
- Group
- A vertical column of the periodic table, containing elements with the same number of outer-shell electrons.
More in Group 7
- Halogens
- Physical Properties
- Size of Atoms
- Melting and Boiling Points
- Trends in Oxidising Ability
- Displacement Reactions
- Halide Ions as Reducing Agents
- Sodium Chloride with Sulfuric Acid
All 16 lessons in Group 7 · All AQA AS-level Chemistry topics