Pages in this set

Page 1

Preview of page 1
C4 ­ Chemical Patterns
Atoms
The Nucleus

The nucleus is the middle of an atom. It contains protons and neutrons. The
protons make the atom have a positive charge. Almost the whole mass of
the atom is concentrated in the nucleus , but it is tiny compared to the rest…

Page 2

Preview of page 2
History of the Periodic Table
In the 1800's the only thing they could measure was relative atomic mass, and so the known
elements were arranged in order of atomic mass.

Doberiner

In 1828 a man called Doberiner started to put this list of elements into groups based on their
chemical…

Page 3

Preview of page 3
repeating patterns in the properties of the elements.

Elements with similar properties form columns. These vertical columns are called groups. The group
number tells you how many electrons there are in the outer shell. For example: group 1 elements all
have one electron in their outer shell and group 7…

Page 4

Preview of page 4
Ionic Bonding
When atoms lose or gain electrons they form charged particles called ions. Ions can be made from
single atoms or groups of atoms. When atoms lose or gain electrons, all they are trying to do is get a
full outer shell.

All the atoms in group 1 of…

Page 5

Preview of page 5
Group 1 ­ The Alkali Metals
Group 1 metals include lithium, sodium, potassium, rubidium, caesium and francium. They all have one
outer shell electron, making them very reactive and give them all similar properties. When alkali
metals react they form similar compounds. The alkali metals are shiny when freshly cut,…

Page 6

Preview of page 6
Group 7 ­ The Halogens
Group 7 elements include fluorine, chlorine, bromine, iodine and astatine. They all have seven outer
electrons. This makes them very reactive, gives them similar properties and means they form similar
compounds to each other. The halogens form diatomic molecules which are pair of atoms.



As…

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »