The outer electronic configuration for group 17 elements is:
ns²np5.
ns¹np³.
ns²np².
ns²np³.
The most chemically reactive non-metals are:
Inert elements.
Group VI elements.
Group V elements.
Halogens.
When a test solution is acidified with excess dilute nitric acid and then a few drops of aqueous silver nitrate added. If an iodide ion is present, then:
A yellow precipitate would be formed.
A white solution would be formed.
A pale-yellow or cream precipitate would be formed.
A white precipitate would be formed.
The chemical reactivity of halogens down the group is in the order:
F₂>Cl₂>Br₂>I₂.
Cl>F₂>Br₂>I₂.
F₂>Cl₂>Br₂=I₂.
F₂>Cl₂>I₂>Br₂.
