The halogens

The halogens are in group 7 of the periodic table

Explain the pattern of reactivity as you go down group 7

The atoms get larger as you go down group 7

So the negative outer shell is further away from the positive nucellus

This means that the electrostatic force between the outershell and nucellus is weaker

So it is harder to gain an electron

What happens as you go down group 7 of the halogens?

Reactivity decreases

Atoms get bigger

They get darker

Boiling point and melting point increase

How do halogens bond to themselves?

Halogens exist diatonically so they bond to themselves with a covalent bond

How do halogens react with metals?

They create metal halides

How do halogens react with non metals?

They make a covalent bond

Why does the boiling point increase as you go down group7?

The boiling increases as you go down group 7 because the size of the atoms increase this means that they have a higher intermolecular force as you go down group 7.

The higher the intermolecular force is the more energy is needed for it to melt or boil

What is displacement?

When a more reactive halogen displaces a less reactive halogen from a compound