2.29 understand that metals can be arranged in a reactivity series based on the reactions of the metals and their compounds: potassium, sodium, lithium, calcium, magnesium, aluminium, zinc, iron, copper, silver and gold

Reactivity series

Potassium
Sodium
Lithium 
Calcium
Magnesium
Aluminium
Zinc
Iron
Tin
Lead
Copper
Silver
Gold
Platinum

The elements at the top are the most reactive and the elements at the bottom are the least reactive.

1.21 write word equations and balanced chemical equations to represent the reactions studied in this specification

Writing balanced chemical equations

There has to be the same number of each atoms/element on both sides of the equation.

Aluminum + copper (II) oxide----> Aluminum oxide + copper

      Al       + CuO           ---->          Al₂O₃   + Cu

1 Al                                            2Al
2 Cu                                           1Cu
1 O                                             3 O


There needs to be the same amount of each elements on both sides, so we must balance it.

2Al + 3CuO ----> Al₂O₃ + 3Cu

2 Al                    2Al
3Cu                    3Cu
3 O                     3O

Now the equation is balanced.

Atomic Structure: 1.14 deduce the electronic configurations of the first 20 elements from their positions in the Periodic Table

Electronic configuration 

The arrangement of electrons into shells for an atom is known as its electronic configuration

As you are given a periodic table in the exam, you don't have to remember all of them, just be able to state them when asked.

They are given in shorthand notations, e.g.
Carbon has 6 electrons, so its EC would be 2.4
Magnesium has 12 electrons, so its EC would be 2.8.2

Atomic Structure 1.13 understand that the Periodic Table is an arrangement of elements in order of atomic number

Periodic Table

As you can see the periodic table, shows all the elements known to man, and is arranged in periods and groups. It shows the arrangement of elements in order of atomic number.

Atoms 1.6 understand the differences between elements, compounds and mixtures

Elements, compounds and mixtures

Elements and compounds have their own chemical properties. The properties of a compound are likely to be different from the elements that have been used to make it. A mixture will have the properties of each substance been used to make it.

Elements- Only one substance, all elements are listed on the periodic table. e.g Na, O, Fe

Molecules- 2 or more elements bonded e.g NaCl, MgO

Mixtures- 2 or more elements that have not been bonded together e.g Iron and sulfur