(40) GCSE Chemistry Revision "Group 7 Part 3 Reactivity of the Halogens"

Halogens

Elements found in Group 7 of the periodic table, including fluorine, chlorine, bromine, iodine, and astatine.

Reactivity

The tendency of a substance to undergo a chemical reaction, either by itself or with other materials.

Displacement Reaction

A type of reaction where a more reactive halogen displaces a less reactive halogen from an aqueous solution of its salt.

Shielding

The phenomenon where inner electrons repel outer electrons, decreasing their attraction to the nucleus.

Fluorine

The most reactive halogen, located at the top of Group 7.

Chlorine

A less reactive halogen than fluorine, located just below it in Group 7.

Group 7

The group in the periodic table that contains the halogens.

Sodium Bromide

An ionic compound formed from sodium and bromine, often dissolved in water to form an aqueous solution.

Potassium Iodide

An ionic compound made from potassium and iodine, used in reactions to demonstrate halogen reactivity.

Lithium Chloride

An ionic compound formed from lithium and chlorine, tested to check for displacement reactions.