GROUP 7 (HALOGENS)

How many electrons do Group 7 elements have in their outer shell?

7 electrons.

What does diatomic mean

A molecule containing two atoms.

What colour and state is chlorine at room temperature

Pale green gas

What colour and state is bromine at room temperature

Red-brown liquid

What colour and state is iodine at room temperature

Grey-black solid. It produces purple vapour when heated.

What happens to the colour of halogens as you go down Group 7

The colour gets darker

What happens to melting and boiling points down Group 7

Both increase

What happens to reactivity down Group 7?

Reactivity decreases.

. Why does reactivity decrease down Group 7

Atoms have more electron shells and increased shielding.

Atoms have more electron shells and increased shielding what happens next

This reduces the attraction between the nucleus and an incoming electron, making it harder to gain one.

How do halogens react

They gain one electron to complete their outer shell.

What is a displacement reaction

A more reactive halogen displaces a less reactive halogen from its halide solution.

Which halogens can chlorine displace

Bromine and iodine

Which halogen can bromine displace

: Iodine.

Can iodine displace chlorine or bromine

No. Iodine is less reactive than both.

What colour forms when bromine is produced in a displacement reaction

Orange.

What colour forms when iodine is produced in a displacement reaction

Brown.