10. Reactivity of halogens

What is the reactivity trend?

Reactivity decreases down the group

How does fluorine react with iron wool?

Cold iron wool bursts into flame

How does fluorine react with sodium?

Reacts violently at room temperature

How does chlorine react with iron wool?

Hot iron wool glows brightly

How does chlorine react with sodium?

Reacts vigorously with hot Na

How does bromide react with iron wool?

Hot iron wool glows, less brightly

How does bromide react with sodium?

Reacts less vigorously with hot Na

How does iodine react with iron wool?

Hot iron wool shows faint red glow

How does iodine react with sodium?

Reacts slowly with hot Na

What is the equation for Chlorine reacting with iron?

2Fe(s)+ + 3Cl2(g) -> 2FeCl3

What is the formula for Iodine reacting with Na?

2Na(s) + I2(s) → 2NaI

What is the general electronic configuration for group 7?

ns2 np5

What are halogens described to be?

Oxidising agents as they accept electrons

How does trend in reactivity of halogens relate to oxidising power?

Reactivity + oxidising power decreases down group -> More shells -> More shielding -> Harder to gain electrons