The Halogens (OCR A-Level Chemistry A): Flashcards

Group 17 (also known as Group 7)

Red-brown liquid

More electrons cause stronger London dispersion forces

Seven electrons ($ns^2np^5$)

Oxidising agents (gain electrons, reduced to $\text{X}^-$)

Decreases (weaker oxidising agents)

Larger atomic radius & more shielding reduce nuclear attraction

Same element simultaneously oxidised and reduced

Sodium chlorate(I), NaClO (household bleach)

Increases ($\text{I}^- > \text{Br}^- > \text{Cl}^-$)