1. Halogens
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity

2. Questions What is another name for elements in group 7?
What name is given to a 1- ion made from a group 7 element?
A reaction in which a more reactive element takes the place of a less reactive element is called?
How do the group 7 elements exist as molecules?

3. Questions What is another name for elements in group 7? Halogen
What name is given to a 1- ion made from a group 7 element? Halide ion
A reaction in which a more reactive element takes the place of a less reactive element is called? Displacement Reaction
How do the group 7 elements exist as molecules? In pairs, e.g. Cl2

4. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity

5. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity
Group VII (The Halogens)
Poisonous elements
Coloured vapours
Low melting points and boiling points
Poor conductors of energy and electricity
Exist as molecules made up of pairs of atoms, joined by covalent bonds.
They need one electron to have a full outer shell (structure of noble gas).
React with metals to gain one electron, ionic bond, e.g. NaCl.
React with other non-metals to share electrons, covalent bond, e.g. HCl.

6. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity
Displacement Reactions between Halogen
This is where a more reactive halogen displaces a less reactive halogen from solution of its salts.
Example:
Bromine displaces iodine as Br is more reactive than I.
Chlorine + Potassium Bromide  Potassium Chloride + Bromine

7. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity
Fluorine
This is the most reactive, but so reactive that is reacts so strongly with water that we cannot carry out any reactions in aqueous solutions.

8. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity
Copy and complete the following reactions:
F2 + ______  2HF
Cl2 + ________  2KCl + I2
Br2 + 2KCl  ______________

9. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity
Copy and complete the following reactions:
F2 + H2  2HF
Cl2 + 2KI  2KCl + I2
Br2 + 2KCl  No Reaction

10. Keywords: Halogen, Displacement Reactions, Reactivity
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity
Complete summary questions from book.

11. Halogens
To know how the Group 7 elements behave.
(Grade C)
To know how the properties of the Group 7 elements change down the group.
(Grade B)
To explain the relative reactivity of Group 7 elements in terms of their electronic structure.
(Grade A/A*)
Keywords: Halogen, Displacement Reactions, Reactivity