Studied by 0 people
Name of Group 7 elements
The halogens
Group 7 elements have similar chemical properties
because they all have 7 outer shell electrons
Diatomic molecule
A molecule consisting of two atoms
Chemical structure of group 7
Diatomic molecules
Pattern in melting points and boiling points down group 7
Melting and boiling points decrease
Pattern of reactivity down the halogens
They get less reactive
Reason for patterns in reactivity
larger atomic radius, more shielding, less nuclear attraction, harder to gain a reaction
Group 7 elements react by
gaining 1 electron
Displacement reaction
A reaction in which a more reactive element replaces a similar element in a compound
Potassium bromide + Chlorine -->
Potassium chloride + Bromine
Sodium chloride + Bromine -->
No reaction
Sodium iodide + Bromine -->
Sodium bromide + Iodine
