Rocks and
Building.
Unit 1 - AQA Chemistry GCSE…read more

Atoms.
Atoms are made up of protons, neutrons and
electrons
Protons and neutrons are kept in the nucleus at
the middle of the atom
The nucleus makes up the majority of the mass
of the atom, but only a tiny part of the atom in
size
The electrons orbit the nucleus in shells, and
they take up a minute amount of the mass AND
size
The electron shells take up most of the space…read more

Elements.
There are many different types of atom
Different types of atom are identified by the
numbers of protons (and electrons) that they
contain
Different atoms have different numbers of
neutrons too, though
If a substance contains only one type of atom, it
is called an element…read more

Symbols.
Different elements are represented by symbols
These symbols are just a shorthand way of
writing the elements out
Each symbol is comprised of one or two letters
Na = Sodium
C = Carbon
Pb = Lead
O = Oxygen
And so on!…read more

The Periodic Table.
The periodic table is laid out so elements
with similar properties are in columns
The vertical columns are called groups
The horizontal rows are called periods…read more

Compounds.
When elements `react', they form chemical
bonds with other atoms
These chemical bonds turn atoms into
compounds
It is normally difficult separate compounds once
they have formed
Electrons are very much involved with
compounds, being either given, taken or shared
Properties of compounds are very different
from the properties of the individual elements…read more