GCSE Chemistry
C1.1 - Fundamental
Ideas in Chemistry
Subatomic Particles
Atomic Particle / Relative Charge
Proton
Neutron
Electron
+1
0
-1
Atomic & Mass
Numbers
The find out the number of neutrons an
atom contains = mass number - atomic
number
Atomic number - The
amount of protons OR
Electrons an atom
contains
Mass Number - The TOTAL amount of
protons AND neutrons an atom
contains - Nom of protons+Nom of
neutrons
Electronic configuration
The first shell always contains a
number of 2 electrons, the rest
contains 8.
For an atom that contains 6
electrons, their electronic
configuration would be written as
[2,6]
Alkali
Metals
(group 1)
Lithium 2,1
Sodium 2,8,1
Potassium 2,8,8,1
All alkali metals react violently when
added to water they also always
produce hydrogen gas and a metal
hyrdoxide e.g.)
Potassium+water-->potassium
hydroxide+hydrogen
When the alklai metals react with
oxygen they always produce a metal
oxide e.g) sodium+oxygen-->sodium
oxide
Halogens
(group 7)
Flourine 2,7
Chlorine 2,8,7
The halogen atoms and
the alkali metals with
react together to form
an ionic compound in
which these are called
halide ions and have a
single negative charge.
Noble Gases
(Group 0)
Helium 2
Neon 2,8
Argon 2,8,8
Noble gases are
unreactive as they all
have a full outer shell.
Mixtures and Compounds
A mixture consists of two or
more elements or compounds
that are not chemically joined,
the properties of the substances
remain unchanged and specific
to each substance.
A compound is a substance
contains two or more elements
are chemically joined together.
Non metal + Non metal =
Covalent bonding
Sharing of electrons
Non metal + metal =
Ionic bonding
gaining/losing electrons
Either way of bonding,
covalent or ionic results in
all outer shells being full.